Spectacled Guillemot vs Cassin's Auklet
Cepphus carbo compared with Ptychoramphus aleuticus
Side-by-Side Comparison
| Attribute | Spectacled Guillemot | Cassin's Auklet |
|---|---|---|
| Scientific Name | Cepphus carbo | Ptychoramphus aleuticus |
| Order | Charadriiformes | Charadriiformes |
| Family | Alcidae | Alcidae |
| Conservation Status | Least Concern | Near Threatened |
| Length | — | — |
| Wingspan | 38.4 cm (15.1 in) | 24.2 cm (9.5 in) |
| Weight | 480.0 g (16.93 oz) | 175.0 g (6.17 oz) |
| Diet | -- | -- |
| Clutch Size | 1-2 | 1 |
| Population Trend | — | — |
Habitat Comparison
Conservation Status
Least Concern
Spectacled Guillemot
Near Threatened
Cassin's Auklet
About These Birds
Spectacled Guillemot
Spectacled Guillemot, 36–38 cm, breeds on rocky coasts and sea cliffs of the western North Pacific from Kamchatka to Japan. Sooty black with white spectacle patches around the eye; red feet. Coastal diver; feeds on fish and crustaceans near rocky reefs. Sedentary; stays close to breeding coast year-round.
Cassin's Auklet
Cassin's Auklet, 21–23 cm, is a small, almost entirely dark grey auklet breeding in burrows on rocky North Pacific islands from Baja California to the Aleutians. Feeds almost exclusively on zooplankton — euphausiids and copepods — at night. Highly colonial; winters near shore.