Viperidae (Vipèrids)

Family

Vipèrids

Viperidae

148 species in our catalog · found in 192 parks

Species in this group

Each card shows the species at its best park — tap for the full profile

Ceylon Pit Viper

Craspedocephalus trigonocephalus

80–90% · Very likely

Florida Cottonmouth

Agkistrodon conanti

70–80% · Very likely

Common Lancehead

Bothrops atrox

70–80% · Very likely

Side-striped palm pit viper

Bothriechis lateralis

60–70% · Likely

Northern Cottonmouth

Agkistrodon piscivorus

60–70% · Likely

Wagler's Pit Viper

Tropidolaemus wagleri

60–70% · Likely

Vogel’s Pit Viper

Trimeresurus vogeli

50–60% · Likely

Prairie Rattlesnake

Crotalus viridis

50–60% · Likely

Ruby-eyed Green Pitviper

Craspedocephalus rubeus

50–60% · Likely

North Philippine Temple Pitviper

Tropidolaemus subannulatus

50–60% · Likely

Fer-de-lance

Bothrops asper

50–60% · Likely

Bothrops bilineata

Bothrops bilineatus

50–60% · Likely

Sidewinder

Crotalus cerastes

50–60% · Likely

Spot-tailed Pitviper

Trimeresurus erythrurus

40–50% · Likely

Cerrado Lancehead

Bothrops pauloensis

40–50% · Likely

Wilson's Montane Pitviper

Cerrophidion wilsoni

40–50% · Likely

Adder

Vipera berus

40–50% · Likely

Neotropical Rattlesnake

Crotalus durissus

40–50% · Likely

Slender Hognose Viper

Porthidium ophryomegas

40–50% · Likely

Patagonia Lancehead

Bothrops ammodytoides

40–50% · Likely

Western Diamondback Rattlesnake

Crotalus atrox

40–50% · Likely

Lowland Hump-nosed Viper

Hypnale zara

40–50% · Likely

Painted Lancehead

Bothrops diporus

40–50% · Likely

Panamint Rattlesnake

Crotalus stephensi

40–50% · Likely

Sabah Bamboo Pitviper

Trimeresurus sabahi

40–50% · Likely

Large-scaled Pit Viper

Craspedocephalus macrolepis

40–50% · Likely

Western Rattlesnake

Crotalus oreganus

40–50% · Likely

Central American Rattlesnake

Crotalus simus

40–50% · Likely

Taiwanese Habu

Protobothrops mucrosquamatus

40–50% · Possible

Urutu Lancehead

Bothrops alternatus

30–40% · Possible

Chinese Green Tree Viper

Trimeresurus stejnegeri

30–40% · Possible

Rainforest Hog-nosed Viper

Porthidium nasutum

30–40% · Possible

Anamala Pit Viper

Craspedocephalus anamallensis

30–40% · Possible

Asp Viper

Vipera aspis

30–40% · Possible

Eastern Black-tailed Rattlesnake

Crotalus ornatus

30–40% · Possible

Eastern Copperhead

Agkistrodon contortrix

30–40% · Possible

Puff Adder

Bitis arietans

30–40% · Possible

Malcolm’s Pitviper

Trimeresurus malcolmi

30–40% · Possible

Horned Adder

Bitis caudalis

30–40% · Possible

Southwestern Speckled Rattlesnake

Crotalus pyrrhus

30–40% · Possible

Beautiful Pitviper

Trimeresurus venustus

30–40% · Possible

Red Diamond Rattlesnake

Crotalus ruber

30–40% · Possible

Great Lakes Bush Viper

Atheris nitschei

30–40% · Possible

Eastern Diamondback Rattlesnake

Crotalus adamanteus

30–40% · Possible

Atropoides mexicanus

Metlapilcoatlus mexicanus

30–40% · Possible

Timber Rattlesnake

Crotalus horridus

30–40% · Possible

White-lipped Pit Viper

Trimeresurus albolabris

30–40% · Possible

Black-speckled Palm Pit Viper

Bothriechis nigroviridis

20–30% · Possible

Brazilian Lancehead

Bothrops moojeni

20–30% · Possible

Chocoan Forest Pit Viper

Bothrops punctatus

Insufficient data

White-lipped Island Pitviper

Trimeresurus insularis

20–30% · Possible

Kramer's Pit Viper

Trimeresurus macrops

20–30% · Possible

Bolivian Lancehead

Bothrops sanctaecrucis

Insufficient data

Yarará Lancehead

Bothrops jararaca

20–30% · Possible

Bothrops taeniata

Bothrops taeniatus

Insufficient data

Sumatra Pit Viper

Trimeresurus sumatranus

20–30% · Possible

Seoane's Viper

Vipera seoanei

20–30% · Possible

Gaboon Adder

Bitis gabonica

Insufficient data

Whitetail Lancehead

Bothrops leucurus

20–30% · Possible

Marbled lancehead

Bothrops marmoratus

20–30% · Possible

See all 60 species Show fewer

Showing the 60 most likely of 148 species — the park table below covers them all.

📅 Monthly Probability

Probability-weighted average across the group's species

20–30

Jan

20–30

Feb

20–30

Mar

20–30

Apr

20–30

May

20–30

Jun

20–30

Jul

20–30

Aug

20–30

Sep

20–30

Oct

20–30

Nov

20–30

Dec

🕐 When They're Spotted

When the group's species are recorded (aggregated)

Where to see Vipèrids

Worldwide records of this group (human observations from 2019 onwards, GBIF). Pins mark our parks — tap one for the chance of seeing at least one species of the group there.

Parks Ranked

Chance of seeing at least one species of the group · number of its species present

#	Park	Country	Species	P(≥1)
1	Sinharaja Forest Reserve	🇱🇰 Sri Lanka	4	90–100%
	Ceylon Pit Viper			80–90%
	Lowland Hump-nosed Viper			40–50%
	Russell's Viper			10–20%
	Hump-nosed Viper			Insufficient data
2	Kinabalu Park	🇲🇾 Malaysia	6	90–100%
	North Philippine Temple Pitviper			40–50%
	Sabah Bamboo Pitviper			40–50%
	Malcolm’s Pitviper			30–40%
	Sumatra Pit Viper			20–30%
	Chasen’s Mountain Pitviper			20–30%
	Borneo Pit Viper			10–20%
3	Emas National Park	🇧🇷 Brazil	5	80–90%
	Cerrado Lancehead			40–50%
	Neotropical Rattlesnake			40–50%
	Urutu Lancehead			30–40%
	Brazilian Lancehead			20–30%
	Mato Grosso Lancehead			Insufficient data
4	Brownsberg Nature Park	🇸🇷 Suriname	2	80–90%
	Common Lancehead			70–80%
	Bothrops bilineata			50–60%
5	Big Cypress National Preserve	🇺🇸 United States	3	80–90%
	Florida Cottonmouth			70–80%
	Eastern Diamondback Rattlesnake			30–40%
	Pygmy Rattlesnake			0–10%
6	Death Valley National Park	🇺🇸 United States	4	80–90%
	Sidewinder			50–60%
	Panamint Rattlesnake			40–50%
	Western Rattlesnake			10–20%
	Mohave Rattlesnake			10–20%
7	Congaree National Park	🇺🇸 United States	3	80–90%
	Northern Cottonmouth			60–70%
	Eastern Copperhead			30–40%
	Timber Rattlesnake			10–20%
8	Braulio Carrillo National Park	🇨🇷 Costa Rica	6	70–80%
	Fer-de-lance			50–60%
	Rainforest Hog-nosed Viper			20–30%
	Side-striped palm pit viper			10–20%
	Black-speckled Palm Pit Viper			10–20%
	Picado's Pit Viper			Insufficient data
	Central American Bushmaster			Insufficient data
9	Khao Sok National Park	🇹🇭 Thailand	4	70–80%
	Wagler's Pit Viper			60–70%
	Sabah Bamboo Pitviper			20–30%
	Malayan Pit Viper			Insufficient data
	Indo-Malayan mountain pitviper			Insufficient data
10	Monteverde Cloud Forest Reserve	🇨🇷 Costa Rica	4	70–80%
	Side-striped palm pit viper			60–70%
	Fer-de-lance			0–10%
	Black-speckled Palm Pit Viper			0–10%
	Slender Hognose Viper			Insufficient data
11	Big Bend National Park	🇺🇸 United States	5	70–80%
	Western Diamondback Rattlesnake			40–50%
	Eastern Black-tailed Rattlesnake			30–40%
	Mohave Rattlesnake			10–20%
	Rock Rattlesnake			0–10%
	Broad-banded Copperhead			Insufficient data
12	Santa Rosa National Park	🇨🇷 Costa Rica	3	70–80%
	Slender Hognose Viper			40–50%
	Central American Rattlesnake			40–50%
	Southern Cantil			Insufficient data
13	Khao Yai National Park	🇹🇭 Thailand	4	70–80%
	Vogel’s Pit Viper			50–60%
	Kramer's Pit Viper			20–30%
	Siamese Russell's Viper			Insufficient data
	White-lipped Pit Viper			Insufficient data
14	Cuc Phuong National Park	🇻🇳 Vietnam	3	60–70%
	Taiwanese Habu			40–50%
	Chinese Green Tree Viper			30–40%
	White-lipped Pit Viper			Insufficient data
15	Tenorio Volcano National Park	🇨🇷 Costa Rica	4	60–70%
	Fer-de-lance			40–50%
	Rainforest Hog-nosed Viper			30–40%
	Side-striped palm pit viper			Insufficient data
	Atropoides mexicanus			0–10%
16	Cat Tien National Park	🇻🇳 Vietnam	3	60–70%
	Ruby-eyed Green Pitviper			50–60%
	White-lipped Pit Viper			20–30%
	Taiwanese Habu			Insufficient data
17	Pico Bonito National Park	🇭🇳 Honduras	3	60–70%
	Rainforest Hog-nosed Viper			30–40%
	Atropoides mexicanus			30–40%
	Fer-de-lance			20–30%
18	Guadalupe Mountains National Park	🇺🇸 United States	3	60–70%
	Western Diamondback Rattlesnake			40–50%
	Eastern Black-tailed Rattlesnake			20–30%
	Rock Rattlesnake			20–30%
19	Utría National Natural Park	🇨🇴 Colombia	4	60–70%
	Fer-de-lance			30–40%
	Chocoan Forest Pit Viper			Insufficient data
	Rainforest Hog-nosed Viper			Insufficient data
	Chocoan bushmaster			Insufficient data
20	Amboró National Park	🇧🇴 Bolivia	6	60–70%
	Bolivian Lancehead			Insufficient data
	Neotropical Rattlesnake			Insufficient data
	Atlantic Forest Bushmaster			Insufficient data
	Painted Lancehead			Insufficient data
	Andean Lancehead			Insufficient data
	Bothrops monsignifer			Insufficient data
21	Danum Valley Conservation Area	🇲🇾 Malaysia	2	60–70%
	North Philippine Temple Pitviper			50–60%
	Sumatra Pit Viper			10–20%
22	Serra da Canastra National Park	🇧🇷 Brazil	5	60–70%
	Marbled lancehead			20–30%
	Neotropical Rattlesnake			20–30%
	Jararaca Pintada			Insufficient data
	Urutu Lancehead			Insufficient data
	Brazilian Lancehead			Insufficient data
23	Piedras Blancas National Park	🇨🇷 Costa Rica	3	60–70%
	Fer-de-lance			50–60%
	White-tailed Hognose Viper			10–20%
	Side-striped palm pit viper			Insufficient data
24	Chirripó National Park	🇨🇷 Costa Rica	7	60–70%
	Side-striped palm pit viper			20–30%
	Costa Rica Montane Pitviper			10–20%
	Blotched Palm-pitviper			10–20%
	Black-speckled Palm Pit Viper			10–20%
	Fer-de-lance			Insufficient data
	Talamancan Palm Pit Viper			Insufficient data
	Atropoides mexicanus			Insufficient data
25	Joshua Tree National Park	🇺🇸 United States	6	60–70%
	Southwestern Speckled Rattlesnake			30–40%
	Sidewinder			10–20%
	Western Rattlesnake			0–10%
	Mohave Rattlesnake			0–10%
	Red Diamond Rattlesnake			0–10%
	Western Diamondback Rattlesnake			0–10%
26	Cusuco National Park	🇭🇳 Honduras	4	60–70%
	Wilson's Montane Pitviper			30–40%
	March's Palm Pit Viper			20–30%
	Fer-de-lance			Insufficient data
	Atropoides mexicanus			10–20%
27	Arenal Volcano National Park	🇨🇷 Costa Rica	4	50–60%
	Fer-de-lance			30–40%
	Atropoides mexicanus			20–30%
	Rainforest Hog-nosed Viper			10–20%
	Side-striped palm pit viper			0–10%
28	Everglades National Park	🇺🇸 United States	3	50–60%
	Florida Cottonmouth			40–50%
	Eastern Diamondback Rattlesnake			20–30%
	Pygmy Rattlesnake			0–10%
29	El Vizcaíno Biosphere Reserve	🇲🇽 Mexico	4	50–60%
	Red Diamond Rattlesnake			30–40%
	Speckled Rattlesnake			10–20%
	Lower California Rattlesnake			10–20%
	Western Rattlesnake			Insufficient data
30	Khao Luang National Park	🇹🇭 Thailand	4	50–60%
	Beautiful Pitviper			30–40%
	Malayan Pit Viper			Insufficient data
	Sabah Bamboo Pitviper			Insufficient data
	Palm vit viper			Insufficient data
31	Badlands National Park	🇺🇸 United States	1	50–60%
	Prairie Rattlesnake			50–60%
32	La Tigra National Park	🇭🇳 Honduras	2	50–60%
	Wilson's Montane Pitviper			40–50%
	🦎 Honduras Jumping Pit Viper			Insufficient data
33	Sequoia and Kings Canyon National Parks	🇺🇸 United States	3	50–60%
	Western Rattlesnake			40–50%
	Panamint Rattlesnake			10–20%
	Sidewinder			Insufficient data
34	Shenandoah National Park	🇺🇸 United States	2	50–60%
	Eastern Copperhead			30–40%
	Timber Rattlesnake			30–40%
35	Chapada Diamantina National Park	🇧🇷 Brazil	4	50–60%
	Neotropical Rattlesnake			20–30%
	Whitetail Lancehead			20–30%
	Yarará Lancehead			Insufficient data
	Caatinga Lancehead			Insufficient data
36	El Impenetrable National Park	🇦🇷 Argentina	2	50–60%
	Painted Lancehead			40–50%
	Neotropical Rattlesnake			Insufficient data
37	Namib-Naukluft National Park	🇳🇦 Namibia	3	50–60%
	Horned Adder			30–40%
	Many-horned Adder			10–20%
	Puff Adder			10–20%
38	Celaque National Park	🇭🇳 Honduras	3	50–60%
	Central American Rattlesnake			Insufficient data
	Wilson's Montane Pitviper			Insufficient data
	🦎 Honduras Jumping Pit Viper			Insufficient data
39	Eravikulam National Park	🇮🇳 India	2	50–60%
	Large-scaled Pit Viper			40–50%
	Anamala Pit Viper			Insufficient data
40	Sundarbans National Park	🇮🇳 India	1	40–50%
	Spot-tailed Pitviper			40–50%
41	Canaima National Park	🇻🇪 Venezuela	2	40–50%
	Common Lancehead			Insufficient data
	Bothrops taeniata			Insufficient data
42	Tatra National Park	🇸🇰 Slovakia	1	40–50%
	Adder			40–50%
43	Great Smoky Mountains National Park	🇺🇸 United States	2	40–50%
	Eastern Copperhead			20–30%
	Timber Rattlesnake			20–30%
44	Garden Route National Park	🇿🇦 South Africa	4	40–50%
	Puff Adder			20–30%
	Rhombic Night Adder			20–30%
	Berg Adder			10–20%
	Red Adder			Insufficient data
45	Ba Be National Park	🇻🇳 Vietnam	2	40–50%
	Vogel’s Pit Viper			30–40%
	Tonkin Pit Viper			Insufficient data
46	Cordillera Azul National Park	🇵🇪 Peru	4	40–50%
	Common Lancehead			20–30%
	Bothrops bilineata			10–20%
	Atlantic Forest Bushmaster			Insufficient data
	Small-eyed Toad-headed Pitviper			Insufficient data
47	Península Valdés	🇦🇷 Argentina	1	40–50%
	Patagonia Lancehead			40–50%
48	Grand Canyon National Park	🇺🇸 United States	5	40–50%
	Western Rattlesnake			30–40%
	Southwestern Speckled Rattlesnake			10–20%
	Western Black-tailed Rattlesnake			Insufficient data
	Mohave Rattlesnake			Insufficient data
	Sidewinder			Insufficient data
49	Manu National Park	🇵🇪 Peru	7	40–50%
	Common Lancehead			10–20%
	Bothrops bilineata			10–20%
	Atlantic Forest Bushmaster			0–10%
	Brazil's Lancehead			0–10%
	Bothrops taeniata			Insufficient data
	Andean Lancehead			Insufficient data
	Small-eyed Toad-headed Pitviper			Insufficient data
50	Corcovado National Park	🇨🇷 Costa Rica	3	40–50%
	Fer-de-lance			40–50%
	Black-headed Bushmaster			Insufficient data
	White-tailed Hognose Viper			Insufficient data
51	Manuel Antonio National Park	🇨🇷 Costa Rica	1	40–50%
	Fer-de-lance			40–50%
52	Volcán Barú National Park	🇵🇦 Panama	3	40–50%
	Black-speckled Palm Pit Viper			20–30%
	Side-striped palm pit viper			Insufficient data
	Costa Rica Montane Pitviper			Insufficient data
53	Periyar National Park	🇮🇳 India	2	40–50%
	Anamala Pit Viper			30–40%
	Large-scaled Pit Viper			Insufficient data
54	Iguaçu National Park	🇧🇷 Brazil	6	40–50%
	Brazilian Lancehead			10–20%
	Neotropical Rattlesnake			10–20%
	Painted Lancehead			10–20%
	Jararacussu			0–10%
	Jararaca Pintada			Insufficient data
	Yarará Lancehead			Insufficient data
55	Triglav National Park	🇸🇮 Slovenia	3	40–50%
	Adder			20–30%
	Nose-horned Viper			10–20%
	Asp Viper			Insufficient data
56	La Amistad International Park (Panama)	🇵🇦 Panama	10	40–50%
	Fer-de-lance			10–20%
	Black-speckled Palm Pit Viper			0–10%
	Side-striped palm pit viper			0–10%
	Rainforest Hog-nosed Viper			0–10%
	Costa Rica Montane Pitviper			<5%
	Blotched Palm-pitviper			<5%
	Central American Bushmaster			Insufficient data
	Atropoides mexicanus			Insufficient data
	Lansberg's Hognose Viper			Insufficient data
	Ujarran Hognose Viper			Insufficient data
57	Montes Azules Biosphere Reserve	🇲🇽 Mexico	3	40–50%
	Atropoides mexicanus			10–20%
	Rainforest Hog-nosed Viper			10–20%
	Fer-de-lance			10–20%
58	Kibale National Park	🇺🇬 Uganda	4	40–50%
	African Bush Viper			Insufficient data
	Rhinoceros Viper			Insufficient data
	Forest Night Adder			Insufficient data
	African Hairy Bush Viper			Insufficient data
59	Podocarpus National Park	🇪🇨 Ecuador	5	40–50%
	Andean Forest-pitviper			10–20%
	Common Lancehead			10–20%
	Bothrops taeniata			Insufficient data
	Lojan Lancehead			10–20%
	Atlantic Forest Bushmaster			Insufficient data
60	Serra dos Órgãos National Park	🇧🇷 Brazil	3	40–50%
	Yarará Lancehead			20–30%
	Jararacussu			10–20%
	Neotropical Rattlesnake			Insufficient data
61	Iguazú National Park	🇦🇷 Argentina	6	40–50%
	Brazilian Lancehead			10–20%
	Neotropical Rattlesnake			10–20%
	Jararacussu			0–10%
	Painted Lancehead			0–10%
	Jararaca Pintada			Insufficient data
	Yarará Lancehead			Insufficient data
62	Rincón de la Vieja National Park	🇨🇷 Costa Rica	3	40–50%
	Fer-de-lance			Insufficient data
	Central American Rattlesnake			Insufficient data
	Atropoides mexicanus			Insufficient data
63	Nyungwe National Park	🇷🇼 Rwanda	2	30–40%
	Great Lakes Bush Viper			30–40%
	Rhinoceros Viper			Insufficient data
64	Cumbres de Monterrey National Park	🇲🇽 Mexico	9	30–40%
	Western Diamondback Rattlesnake			0–10%
	Tamaulipan Rock Rattlesnake			0–10%
	Totonacan Rattlesnake			0–10%
	Rock Rattlesnake			0–10%
	Western Black-tailed Rattlesnake			0–10%
	Mohave Rattlesnake			Insufficient data
	Twin-spotted Rattlesnake			0–10%
	Eastern Black-tailed Rattlesnake			<5%
	Taylor's Cantil			<5%
65	Gandoca-Manzanillo Wildlife Refuge	🇨🇷 Costa Rica	3	30–40%
	Rainforest Hog-nosed Viper			20–30%
	Fer-de-lance			10–20%
	Central American Bushmaster			0–10%
66	Darién National Park	🇵🇦 Panama	4	30–40%
	Fer-de-lance			20–30%
	Rainforest Hog-nosed Viper			10–20%
	Lansberg's Hognose Viper			10–20%
	Chocoan bushmaster			Insufficient data
67	Mercantour National Park	🇫🇷 France	2	30–40%
	Asp Viper			30–40%
	Meadow Viper			Insufficient data
68	Bahía de Loreto National Park	🇲🇽 Mexico	4	30–40%
	Red Diamond Rattlesnake			10–20%
	Speckled Rattlesnake			10–20%
	Lower California Rattlesnake			0–10%
	Santa Catalina Island Rattlesnake			0–10%
69	Henri Pittier National Park	🇻🇪 Venezuela	2	30–40%
	Common Lancehead			20–30%
	Neotropical Rattlesnake			10–20%
70	Calakmul Biosphere Reserve	🇲🇽 Mexico	4	30–40%
	Yucatán Neotropical Rattlesnake			10–20%
	Fer-de-lance			10–20%
	Yucatecan Cantil			Insufficient data
	Yucatán Hognose Viper			Insufficient data
71	Snowdonia National Park	🇬🇧 United Kingdom	1	30–40%
	Adder			30–40%
72	Reserva de la Biosfera Mariposa Monarca	🇲🇽 Mexico	4	30–40%
	Dusky Rattlesnake			20–30%
	Western Black-tailed Rattlesnake			Insufficient data
	Tlaloc's Rattlesnake			Insufficient data
	Mexican Lancehead Rattlesnake			Insufficient data
73	Madidi National Park	🇧🇴 Bolivia	4	30–40%
	Common Lancehead			10–20%
	Atlantic Forest Bushmaster			Insufficient data
	Neotropical Rattlesnake			Insufficient data
	Bothrops bilineata			Insufficient data
74	Pyrénées National Park	🇫🇷 France	3	30–40%
	Asp Viper			20–30%
	Seoane's Viper			10–20%
	Lataste's Viper			Insufficient data
75	Taroko National Park	🇹🇼 Taiwan	4	30–40%
	Chinese Green Tree Viper			10–20%
	Kikuchi Habu			10–20%
	Taiwanese Habu			Insufficient data
	Taiwan mountain pitviper			Insufficient data
76	Tambopata National Reserve	🇵🇪 Peru	4	30–40%
	Common Lancehead			10–20%
	Bothrops bilineata			10–20%
	Atlantic Forest Bushmaster			10–20%
	Brazil's Lancehead			Insufficient data
77	Addo Elephant National Park	🇿🇦 South Africa	4	30–40%
	Puff Adder			20–30%
	Rhombic Night Adder			10–20%
	🦎 Albany Adder			0–10%
	Berg Adder			Insufficient data
78	Tayrona National Natural Park	🇨🇴 Colombia	2	30–40%
	Fer-de-lance			20–30%
	Lansberg's Hognose Viper			10–20%
79	Itatiaia National Park	🇧🇷 Brazil	3	30–40%
	Yarará Lancehead			20–30%
	Neotropical Rattlesnake			Insufficient data
	Fonseca's Lancehead			Insufficient data
80	Kaeng Krachan National Park	🇹🇭 Thailand	3	30–40%
	White-lipped Pit Viper			30–40%
	Chinese Mountain Pit Viper			Insufficient data
	Wagler's Pit Viper			Insufficient data
81	Sierra de la Macarena National Park	🇨🇴 Colombia	2	30–40%
	Common Lancehead			20–30%
	Bothrops taeniata			Insufficient data
82	Zion National Park	🇺🇸 United States	2	30–40%
	Western Rattlesnake			30–40%
	Sidewinder			Insufficient data
83	Cairngorms National Park	🇬🇧 United Kingdom	1	30–40%
	Adder			30–40%
84	Tapantí-Macizo de la Muerte National Park	🇨🇷 Costa Rica	7	30–40%
	Fer-de-lance			10–20%
	Side-striped palm pit viper			0–10%
	Black-speckled Palm Pit Viper			0–10%
	Rainforest Hog-nosed Viper			Insufficient data
	Costa Rica Montane Pitviper			Insufficient data
	Central American Bushmaster			Insufficient data
	Blotched Palm-pitviper			Insufficient data
85	Aigüestortes National Park	🇪🇸 Spain	1	30–40%
	Asp Viper			30–40%
86	Ruaha National Park	🇹🇿 Tanzania	1	30–40%
	Puff Adder			30–40%
87	Sian Ka'an Biosphere Reserve	🇲🇽 Mexico	3	30–40%
	Fer-de-lance			20–30%
	Yucatán Hognose Viper			Insufficient data
	Yucatán Neotropical Rattlesnake			Insufficient data
88	Yasuní National Park	🇪🇨 Ecuador	4	30–40%
	Common Lancehead			10–20%
	Bothrops bilineata			10–20%
	Amazonian Toad-headed Pitviper			Insufficient data
	Atlantic Forest Bushmaster			Insufficient data
89	Cahuita National Park	🇨🇷 Costa Rica	3	30–40%
	Rainforest Hog-nosed Viper			10–20%
	Fer-de-lance			10–20%
	Central American Bushmaster			Insufficient data
90	Kerinci Seblat National Park	🇮🇩 Indonesia	3	30–40%
	Wagler's Pit Viper			Insufficient data
	Sabah Bamboo Pitviper			Insufficient data
	Ashy Pit Viper			Insufficient data
91	Bavarian Forest National Park	🇩🇪 Germany	1	30–40%
	Adder			30–40%
92	Yosemite National Park	🇺🇸 United States	1	30–40%
	Western Rattlesnake			30–40%
93	Gobi Gurvansaikhan National Park	🇲🇳 Mongolia	2	20–30%
	Halys Pit Viper			Insufficient data
	🦎 Alashan Pitviper			Insufficient data
94	Noel Kempff Mercado National Park	🇧🇴 Bolivia	1	20–30%
	Neotropical Rattlesnake			Insufficient data
95	Farallones de Cali National Natural Park	🇨🇴 Colombia	4	20–30%
	Highland Eyelash-Pitviper			10–20%
	Fer-de-lance			Insufficient data
	Chocoan Forest Pit Viper			Insufficient data
	Chocoan bushmaster			Insufficient data
96	Soberanía National Park	🇵🇦 Panama	1	20–30%
	Fer-de-lance			20–30%
97	Kanha National Park	🇮🇳 India	2	20–30%
	Common Bamboo Viper			20–30%
	Salazar's Pit Viper			Insufficient data
98	Kgalagadi Transfrontier Park	🇿🇦 South Africa	2	20–30%
	Puff Adder			20–30%
	Horned Adder			Insufficient data
99	Bali Barat National Park	🇮🇩 Indonesia	1	20–30%
	White-lipped Island Pitviper			20–30%
100	Kidepo Valley National Park	🇺🇬 Uganda	1	20–30%
	Puff Adder			Insufficient data
101	Cuyabeno Wildlife Reserve	🇪🇨 Ecuador	4	20–30%
	Common Lancehead			10–20%
	Bothrops bilineata			0–10%
	Amazonian Toad-headed Pitviper			Insufficient data
	Atlantic Forest Bushmaster			Insufficient data
102	Palo Verde National Park	🇨🇷 Costa Rica	2	20–30%
	Slender Hognose Viper			10–20%
	Central American Rattlesnake			Insufficient data
103	Amacayacu National Natural Park	🇨🇴 Colombia	1	20–30%
	Common Lancehead			20–30%
104	Iberá National Park	🇦🇷 Argentina	1	20–30%
	Urutu Lancehead			20–30%
105	Bwindi Impenetrable National Park	🇺🇬 Uganda	2	20–30%
	Great Lakes Bush Viper			10–20%
	Rhinoceros Viper			Insufficient data
106	Niokolo-Koba National Park	🇸🇳 Senegal	1	20–30%
	Puff Adder			Insufficient data
107	Doi Inthanon National Park	🇹🇭 Thailand	3	20–30%
	Chinese Mountain Pit Viper			10–20%
	🦎 Guo's Green Pit Viper			Insufficient data
	Kramer's Pit Viper			Insufficient data
108	Cockscomb Basin Wildlife Sanctuary	🇧🇿 Belize	2	20–30%
	Fer-de-lance			20–30%
	Atropoides mexicanus			Insufficient data
109	El Palmar National Park	🇦🇷 Argentina	1	20–30%
	Urutu Lancehead			20–30%
110	Carara National Park	🇨🇷 Costa Rica	1	20–30%
	Fer-de-lance			20–30%
111	Chapada dos Guimarães National Park	🇧🇷 Brazil	2	20–30%
	Brazilian Lancehead			Insufficient data
	Neotropical Rattlesnake			Insufficient data
112	Cévennes National Park	🇫🇷 France	2	20–30%
	Asp Viper			10–20%
	Adder			Insufficient data
113	South Luangwa National Park	🇿🇲 Zambia	3	20–30%
	Snouted Night Adder			Insufficient data
	Rhombic Night Adder			Insufficient data
	Puff Adder			Insufficient data
114	Picos de Europa National Park	🇪🇸 Spain	1	20–30%
	Seoane's Viper			20–30%
115	Table Mountain National Park	🇿🇦 South Africa	2	20–30%
	Puff Adder			20–30%
	Berg Adder			0–10%
116	Waterberg Plateau Park	🇳🇦 Namibia	1	20–30%
	Puff Adder			Insufficient data
117	Gorongosa National Park	🇲🇿 Mozambique	2	20–30%
	Snouted Night Adder			10–20%
	Puff Adder			Insufficient data
118	Chagres National Park	🇵🇦 Panama	2	20–30%
	Rainforest Hog-nosed Viper			10–20%
	Fer-de-lance			10–20%
119	Tortuguero National Park	🇨🇷 Costa Rica	2	20–30%
	Fer-de-lance			20–30%
	Rainforest Hog-nosed Viper			Insufficient data
120	Semuliki National Park	🇺🇬 Uganda	1	20–30%
	Gaboon Adder			Insufficient data
121	iSimangaliso Wetland Park	🇿🇦 South Africa	4	20–30%
	Puff Adder			0–10%
	Gaboon Adder			0–10%
	Snouted Night Adder			Insufficient data
	Rhombic Night Adder			Insufficient data
122	Kruger National Park	🇿🇦 South Africa	3	20–30%
	Puff Adder			10–20%
	Snouted Night Adder			0–10%
	Rhombic Night Adder			Insufficient data
123	Marino Ballena National Park	🇨🇷 Costa Rica	1	20–30%
	Fer-de-lance			20–30%
124	Tijuca National Park	🇧🇷 Brazil	2	20–30%
	Yarará Lancehead			10–20%
	Jararacussu			0–10%
125	Poás Volcano National Park	🇨🇷 Costa Rica	1	20–30%
	Side-striped palm pit viper			Insufficient data
126	Nagarhole National Park	🇮🇳 India	2	20–30%
	Hump-nosed Viper			Insufficient data
	Craspedocephalus malabaricus			Insufficient data
127	San Lorenzo Protected Forest	🇵🇦 Panama	1	20–30%
	Fer-de-lance			Insufficient data
128	Gauja National Park	🇱🇻 Latvia	1	20–30%
	Adder			Insufficient data
129	Samburu National Reserve	🇰🇪 Kenya	2	10–20%
	Puff Adder			Insufficient data
	Egyptian Saw-scaled Viper			Insufficient data
130	Nikko National Park	🇯🇵 Japan	1	10–20%
	Short-tailed Mamushi			Insufficient data
131	Anavilhanas National Park	🇧🇷 Brazil	1	10–20%
	Common Lancehead			Insufficient data
132	Kafue National Park	🇿🇲 Zambia	2	10–20%
	Puff Adder			Insufficient data
	Rhombic Night Adder			Insufficient data
133	Kinabatangan Wildlife Sanctuary	🇲🇾 Malaysia	2	10–20%
	North Philippine Temple Pitviper			10–20%
	Borneo Pit Viper			Insufficient data
134	Satpura National Park	🇮🇳 India	2	10–20%
	Russell's Viper			Insufficient data
	Saw-scaled Viper			Insufficient data
135	Cerro Azul Meámbar National Park	🇭🇳 Honduras	2	10–20%
	Atropoides mexicanus			Insufficient data
	Fer-de-lance			Insufficient data
136	Murchison Falls National Park	🇺🇬 Uganda	2	10–20%
	Puff Adder			Insufficient data
	Gaboon Adder			Insufficient data
137	Way Kambas National Park	🇮🇩 Indonesia	1	10–20%
	Wagler's Pit Viper			Insufficient data
138	Ordesa y Monte Perdido National Park	🇪🇸 Spain	1	10–20%
	Asp Viper			10–20%
139	Ría Lagartos Biosphere Reserve	🇲🇽 Mexico	1	10–20%
	Yucatán Neotropical Rattlesnake			10–20%
140	Bastimentos Island National Marine Park	🇵🇦 Panama	1	10–20%
	Fer-de-lance			10–20%
141	Channel Islands National Park	🇺🇸 United States	1	10–20%
	Western Rattlesnake			10–20%
142	Queen Elizabeth National Park	🇺🇬 Uganda	2	10–20%
	Puff Adder			Insufficient data
	Great Lakes Bush Viper			Insufficient data
143	Bandipur National Park	🇮🇳 India	2	10–20%
	Hump-nosed Viper			Insufficient data
	Craspedocephalus malabaricus			Insufficient data
144	Etosha National Park	🇳🇦 Namibia	2	10–20%
	Puff Adder			0–10%
	Horned Adder			Insufficient data
145	Nairobi National Park	🇰🇪 Kenya	1	10–20%
	Puff Adder			Insufficient data
146	Tsavo East National Park	🇰🇪 Kenya	1	10–20%
	Puff Adder			10–20%
147	Machalilla National Park	🇪🇨 Ecuador	2	10–20%
	Fer-de-lance			Insufficient data
	Manabí Hognose Viper			Insufficient data
148	Khangchendzonga National Park	🇮🇳 India	1	10–20%
	Chinese Mountain Pit Viper			Insufficient data
149	Horton Plains National Park	🇱🇰 Sri Lanka	1	10–20%
	Gloyd's Hump-nosed Viper			Insufficient data
150	Tsavo West National Park	🇰🇪 Kenya	1	10–20%
	Puff Adder			10–20%
151	Mudumalai National Park	🇮🇳 India	1	10–20%
	Craspedocephalus malabaricus			Insufficient data
152	Wilpattu National Park	🇱🇰 Sri Lanka	1	10–20%
	Hump-nosed Viper			Insufficient data
153	Biebrza National Park	🇵🇱 Poland	1	10–20%
	Adder			Insufficient data
154	Białowieża National Park	🇵🇱 Poland	1	10–20%
	Adder			Insufficient data
155	Kiskunság National Park	🇭🇺 Hungary	1	10–20%
	Meadow Viper			Insufficient data
156	Chingaza National Natural Park	🇨🇴 Colombia	1	10–20%
	🦎 Bothrocophias myrringae			Insufficient data
157	Wadden Sea National Park	🇩🇪 Germany	1	10–20%
	Adder			10–20%
158	Masai Mara National Reserve	🇰🇪 Kenya	2	10–20%
	Puff Adder			0–10%
	Green Night Adder			Insufficient data
159	Volcanoes National Park	🇷🇼 Rwanda	1	10–20%
	Great Lakes Bush Viper			Insufficient data
160	Serengeti National Park	🇹🇿 Tanzania	2	10–20%
	Puff Adder			0–10%
	Green Night Adder			Insufficient data
161	Pilanesberg National Park	🇿🇦 South Africa	1	10–20%
	Puff Adder			10–20%
162	Moremi Game Reserve	🇧🇼 Botswana	1	10–20%
	Puff Adder			10–20%
163	Akagera National Park	🇷🇼 Rwanda	1	10–20%
	Puff Adder			Insufficient data
164	Los Nevados National Natural Park	🇨🇴 Colombia	1	10–20%
	Highland Eyelash-Pitviper			10–20%
165	Hluhluwe-Imfolozi Park	🇿🇦 South Africa	2	10–20%
	Puff Adder			Insufficient data
	Snouted Night Adder			Insufficient data
166	Jiuzhaigou National Park	🇨🇳 China	1	0–10%
	Jiuzhai pitviper			Insufficient data
167	Redwood National Park	🇺🇸 United States	1	0–10%
	Western Rattlesnake			Insufficient data
168	Langtang National Park	🇳🇵 Nepal	1	0–10%
	Himalayan Pitviper			Insufficient data
169	Coiba National Park	🇵🇦 Panama	1	0–10%
	Fer-de-lance			Insufficient data
170	Cañón del Sumidero National Park	🇲🇽 Mexico	2	0–10%
	Tehuantepec Isthmus Neotropical Rattlesnake			Insufficient data
	Central American Rattlesnake			Insufficient data
171	Ostional Wildlife Refuge	🇨🇷 Costa Rica	1	0–10%
	Central American Rattlesnake			Insufficient data
172	Ngorongoro Conservation Area	🇹🇿 Tanzania	1	0–10%
	Puff Adder			0–10%
173	Lake Mburo National Park	🇺🇬 Uganda	1	0–10%
	Green Night Adder			Insufficient data
174	Tarangire National Park	🇹🇿 Tanzania	1	0–10%
	Puff Adder			Insufficient data
175	Sierra de Guadarrama National Park	🇪🇸 Spain	1	0–10%
	Lataste's Viper			0–10%
176	Minneriya National Park	🇱🇰 Sri Lanka	1	0–10%
	Hump-nosed Viper			Insufficient data
177	Las Baulas Marine National Park	🇨🇷 Costa Rica	1	0–10%
	Slender Hognose Viper			Insufficient data
178	Lake Manyara National Park	🇹🇿 Tanzania	1	0–10%
	Puff Adder			Insufficient data
179	Parque Natural Metropolitano	🇵🇦 Panama	1	0–10%
	Fer-de-lance			Insufficient data
180	Mkomazi National Park	🇹🇿 Tanzania	1	0–10%
	Green Night Adder			Insufficient data
181	Ranthambore National Park	🇮🇳 India	1	0–10%
	Saw-scaled Viper			Insufficient data
182	Chobe National Park	🇧🇼 Botswana	1	0–10%
	Puff Adder			Insufficient data
183	Lake Nakuru National Park	🇰🇪 Kenya	1	0–10%
	Puff Adder			Insufficient data
184	Lago de Yojoa	🇭🇳 Honduras	1	0–10%
	Fer-de-lance			Insufficient data
185	Monfragüe National Park	🇪🇸 Spain	1	0–10%
	Lataste's Viper			Insufficient data
186	Parque Estadual Encontro das Águas	🇧🇷 Brazil	1	0–10%
	Brazilian Lancehead			Insufficient data
187	Chitwan National Park	🇳🇵 Nepal	1	0–10%
	Nepal Pitviper			Insufficient data
188	Yellowstone National Park	🇺🇸 United States	1	0–10%
	Prairie Rattlesnake			0–10%
189	Yala National Park	🇱🇰 Sri Lanka	1	0–10%
	Russell's Viper			Insufficient data
190	Amboseli National Park	🇰🇪 Kenya	1	0–10%
	Puff Adder			Insufficient data
191	Sierra Nevada National Park	🇪🇸 Spain	1	<5%
	Lataste's Viper			Insufficient data
192	Doñana National Park	🇪🇸 Spain	1	<5%
	Lataste's Viper			Insufficient data