Brown-headed Cowbird

Brown-headed Cowbird

Molothrus ater

Least ConcernNear ThreatenedVulnerableEndangeredCritically Endangered
Daily sighting probability ~10% · With luck
at Saguaro National Park
5,224 Verified sightings at Saguaro National Park From 2019 to 2026
41,084 Verified sightings across all 41 parks From 2019 to 2026
May Best month highest sighting rate
☀️ Diurnal When it's spotted during daytime hours (6am–6pm)

About the Brown-headed Cowbird

The brown-headed cowbird (Molothrus ater) is a small, obligate brood parasitic icterid native to temperate and subtropical North America. It is a permanent resident in the southern parts of its range; northern birds migrate to the southern United States and Mexico in winter, returning to their summer habitat around March or April.

The brown-headed cowbird was described by the French polymath Georges-Louis Leclerc, Comte de Buffon in 1775 in his Histoire Naturelle des Oiseaux from a specimen collected in the Carolinas. The bird was also illustrated in a hand-colored plate engraved by François-Nicolas Martinet in the Planches Enluminées D'Histoire Naturelle, which was produced under the supervision of Edme-Louis Daubenton to accompany Buffon's text. Neither the plate caption nor Buffon's description included a scientific name, but in 1783, Dutch naturalist Pieter Boddaert coined the binomial name Oriolus ater in his catalogue of the Planches Enluminées. The brown-headed cowbird is now placed in the genus Molothrus that was introduced by English naturalist William Swainson in 1832 with the brown-headed cowbird as the type species. The genus name combines the Ancient Greek... Wikipedia →

Global Distribution

Where this species is recorded worldwide. Restricted to human observations from 2019 onwards — the same kind of record and the same period the probabilities on this page are built from, so collar-tracking studies, camera-trap arrays and museum specimens are excluded. Around Santa Rosa that removes 5,924 GPS fixes from a handful of tagged jaguars.

where this species is recorded (GBIF density — it tracks where observers go, not how likely a sighting is)  ·  parks where it occurs — tap a pin for the sighting probability there

Parks Where Found

# Park Country Daily sighting probability
1 Point Pelee National Park 🇨🇦 Canada
~60%
2 Badlands National Park 🇺🇸 United States
~40%
3 Elk Island National Park 🇨🇦 Canada
~30%
4 Yellowstone National Park 🇺🇸 United States
~30%
5 Grand Teton National Park 🇺🇸 United States
~20%
6 Big Bend National Park 🇺🇸 United States
~20%
7 Shenandoah National Park 🇺🇸 United States
~20%
8 Yosemite National Park 🇺🇸 United States
~20%
9 Banff National Park 🇨🇦 Canada
~20%
10 Jasper National Park 🇨🇦 Canada
~20%
11 Riding Mountain National Park 🇨🇦 Canada
~20%
12 Great Smoky Mountains National Park 🇺🇸 United States
~20%
13 Pacific Rim National Park Reserve 🇨🇦 Canada
~10%
14 Sequoia and Kings Canyon National Parks 🇺🇸 United States
~10%
15 Channel Islands National Park 🇺🇸 United States
~10%
16 Death Valley National Park 🇺🇸 United States
~10%
17 Everglades National Park 🇺🇸 United States
~10%
18 Glacier National Park 🇺🇸 United States
~10%
19 Congaree National Park 🇺🇸 United States
~10%
20 Saguaro National Park 🇺🇸 United States
~10%
21 Rocky Mountain National Park 🇺🇸 United States
~10%
22 Grand Canyon National Park 🇺🇸 United States
~10%
23 Redwood National Park 🇺🇸 United States
~10%
24 Guadalupe Mountains National Park 🇺🇸 United States
~10%
25 Zion National Park 🇺🇸 United States
~10%
26 Olympic National Park 🇺🇸 United States
~10%
27 El Vizcaíno Biosphere Reserve 🇲🇽 Mexico
~10%
28 Cabo Pulmo National Park 🇲🇽 Mexico
~10%
29 Great Bear Rainforest 🇨🇦 Canada
~10%
30 Joshua Tree National Park 🇺🇸 United States
<5%
31 Bahía de Loreto National Park 🇲🇽 Mexico
<5%
32 Big Cypress National Preserve 🇺🇸 United States
<5%
33 Voyageurs National Park 🇺🇸 United States
<5%
34 Acadia National Park 🇺🇸 United States
<5%
35 Celestún Biosphere Reserve 🇲🇽 Mexico
<5%
36 Kluane National Park 🇨🇦 Canada
Insufficient data
37 Cape Breton Highlands National Park 🇨🇦 Canada
Insufficient data
38 Reserva de la Biosfera Mariposa Monarca 🇲🇽 Mexico
Insufficient data
39 Isle Royale National Park 🇺🇸 United States
Insufficient data
40 Gros Morne National Park 🇨🇦 Canada
Insufficient data
41 Wrangell-St. Elias National Park 🇺🇸 United States
Insufficient data

Quick answers

What are the chances of seeing a Brown-headed Cowbird in Saguaro National Park?

About 10% of wildlife watchers report a Brown-headed Cowbird sighting in Saguaro National Park, based on 5,224 verified sightings from GBIF citizen-science data.

When is the best time to see Brown-headed Cowbird in Saguaro National Park?

May has the highest sighting rate for Brown-headed Cowbird in Saguaro National Park in our monthly data.

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