Sandwich Tern
Thalasseus sandvicensis
- KingdomAnimalia (Animals)
- PhylumChordata (Cordats)
- ClassAves (Aus)
- OrderCharadriiformes (Caradriformes)
- FamilyLaridae (Gulls, Terns, and Skimmers)
- GenusThalasseus (Crested Terns)
- SpeciesThalasseus sandvicensis (Sandwich Tern)
Closest Relatives at Ría Lagartos Biosphere Reserve
Royal Tern
Thalasseus maximus
Cabot's Tern
Thalasseus acuflavidus
Laughing Gull
Leucophaeus atricilla
Black Skimmer
Rynchops niger
Gull-billed Tern
Gelochelidon nilotica
Caspian Tern
Hydroprogne caspia
Forster's Tern
Sterna forsteri
American Herring Gull
Larus smithsonianus
Least Tern
Sternula antillarum
Lesser Black-backed Gull
Larus fuscus
Ring-billed Gull
Larus delawarensis
Black Tern
Chlidonias niger
📅 Monthly Probability
☀️ When They're Spotted
Most active during daytime hours (6am–6pm) · across all parks (global)
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
Quick answers
What are the chances of seeing a Sandwich Tern in Ría Lagartos Biosphere Reserve?
About 53% of visitor-days record a Sandwich Tern sighting in Ría Lagartos Biosphere Reserve, based on 510 observer-days of citizen-science data from GBIF.
When is the best time to see Sandwich Tern in Ría Lagartos Biosphere Reserve?
November has the highest sighting rate for Sandwich Tern in Ría Lagartos Biosphere Reserve in our monthly data.