Arctic Tern vs Caspian Tern
Sterna paradisaea comparado com Hydroprogne caspia
Side-by-Side Comparison
| Atributo | Arctic Tern | Caspian Tern |
|---|---|---|
| Nome científico | Sterna paradisaea | Hydroprogne caspia |
| Ordem | Charadriiformes | Charadriiformes |
| Família | Laridae | Laridae |
| Estado de conservação | Least Concern | Least Concern |
| Comprimento | 34,0 cm (13.4 in) | — |
| Envergadura | 80,0 cm (31.5 in) | 82,1 cm (32.3 in) |
| Peso | 110,0 g (3.88 oz) | 656,0 g (23.14 oz) |
| Dieta | Small fish and crustaceans caught by plunge-diving from the air. Hovers briefly before diving. | -- |
| Tamanho da postura | 2-3 | 2-4 |
| Population Trend | — | — |
Size Comparison
Habitat Comparison
Arctic Tern
Breeds on coastal and tundra habitats. Spends most of its life at sea over the open ocean. Nests in colonies on beaches and rocky shores.
Song & Call Comparison
Arctic Tern
A sharp, grating 'kree-yah' alarm call. Also gives 'kik-kik-kik' near the nest. Highly aggressive vocally during the Arctic breeding season. Calls are harsh and insistent.
Caspian Tern
Geographic Range & Migration
Arctic Tern
Breeds in the Arctic and sub-Arctic. Migrates to the Antarctic, experiencing two summers per year. Found on every ocean.
Caspian Tern
Estado de conservação
Arctic Tern
Caspian Tern
How to Tell Them Apart
Arctic Tern
Pale grey upperparts, white underparts with a black cap. Blood-red bill and short red legs. Deeply forked tail streamers. Winter adults lose the full black cap.
Slender, pointed, bright red bill
Caspian Tern
About These Birds
Arctic Tern
The Arctic tern holds the record for the longest known migration of any animal, traveling roughly 70,000 km annually from Arctic to Antarctic and back. Over its 30-year lifespan, it may fly the equivalent of three round trips to the Moon. This remarkable bird experiences more daylight than any other creature on Earth.
Caspian Tern
O trinta-réis-real é o maior trinta-réis do mundo, com bico vermelho robusto e capuz preto, encontrado em costas e grandes lagos em todos os continentes exceto a Antártica.