Heermann's Gull vs Snowy-crowned Tern
Larus heermanni compared with Sterna trudeaui
Side-by-Side Comparison
| Attribute | Heermann's Gull | Snowy-crowned Tern |
|---|---|---|
| Scientific Name | Larus heermanni | Sterna trudeaui |
| Order | Charadriiformes | Charadriiformes |
| Family | Laridae | Laridae |
| Conservation Status | Near Threatened | Least Concern |
| Length | — | — |
| Wingspan | 67.2 cm (26.5 in) | 51.2 cm (20.2 in) |
| Weight | 448.26666666666665 g (15.81 oz) | 149.75 g (5.28 oz) |
| Diet | -- | -- |
| Clutch Size | 1-2 | 2-4 |
| Population Trend | — | — |
Habitat Comparison
Conservation Status
Near Threatened
Heermann's Gull
Least Concern
Snowy-crowned Tern
About These Birds
Heermann's Gull
Heermann's Gull, 46–51 cm, is distinctive — dark grey body, white head (breeding), red bill. Breeds almost entirely on Isla Rasa in the Gulf of California, then disperses north along the Pacific coast to British Columbia. Kleptoparasite; steals fish from Brown Pelicans. Near Threatened; range highly restricted.
Snowy-crowned Tern
Snowy-crowned Tern, 33–35 cm, breeds along the Atlantic coasts of Argentina and Uruguay, wintering north to southern Brazil. White crown with black post-ocular mark (unlike a full black cap), yellow-tipped red bill. Coastal and estuarine piscivore; plunge-dives for small fish.