Gull-billed Tern
Gelochelidon nilotica
- KingdomAnimalia (Animals)
- PhylumChordata (Cordats)
- ClassAves (Aus)
- OrderCharadriiformes (Caradriformes)
- FamilyLaridae (Gulls, Terns, and Skimmers)
- GenusGelochelidon (Gull-billed Terns)
- SpeciesGelochelidon nilotica (Gull-billed Tern)
Closest Relatives at Ría Lagartos Biosphere Reserve
Laughing Gull
Leucophaeus atricilla
Royal Tern
Thalasseus maximus
Sandwich Tern
Thalasseus sandvicensis
Black Skimmer
Rynchops niger
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
Cabot's Tern
Thalasseus acuflavidus
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 Gull-billed Tern in Ría Lagartos Biosphere Reserve?
About 25% of visitor-days record a Gull-billed Tern sighting in Ría Lagartos Biosphere Reserve, based on 240 observer-days of citizen-science data from GBIF.
When is the best time to see Gull-billed Tern in Ría Lagartos Biosphere Reserve?
May has the highest sighting rate for Gull-billed Tern in Ría Lagartos Biosphere Reserve in our monthly data.