Bonaparte's Gull
Chroicocephalus philadelphia
- KingdomAnimalia (Animals)
- PhylumChordata (Cordats)
- ClassAves (Aus)
- OrderCharadriiformes (Caradriformes)
- FamilyLaridae (Gulls, Terns, and Skimmers)
- GenusChroicocephalus (Masked Gulls and allies)
- SpeciesChroicocephalus philadelphia (Bonaparte's Gull)
Bonaparte's gull (Chroicocephalus philadelphia) is a gull found mainly in northern North America. At 28 to 38 cm (11 to 15 in) in length, it is one of the smallest species of gull. Its plumage is mainly white with grey upperparts. During breeding season, Bonaparte's gull gains a slaty-black hood. The sexes are similar in appearance. Wikipedia →
Closest Relatives at Isla del Coco National Park
White Tern
Gygis alba
Brown Noddy
Anous stolidus
Franklin's Gull
Leucophaeus pipixcan
Black Noddy
Anous minutus
Laughing Gull
Leucophaeus atricilla
Common Tern
Sterna hirundo
Arctic Tern
Sterna paradisaea
Sooty Tern
Onychoprion fuscatus
Whimbrel
Numenius phaeopus
Semipalmated Plover
Charadrius semipalmatus
Wandering Tattler
Tringa incana
Hudsonian Whimbrel
Numenius hudsonicus
📅 Monthly Probability
Fewer than 5 records of Bonaparte's Gull at Isla del Coco National Park — not enough to chart months honestly.
☀️ 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