Cassin's Auklet vs Ancient Murrelet
Ptychoramphus aleuticus compared with Synthliboramphus antiquus
Side-by-Side Comparison
| Attribute | Cassin's Auklet | Ancient Murrelet |
|---|---|---|
| Scientific Name | Ptychoramphus aleuticus | Synthliboramphus antiquus |
| Order | Charadriiformes | Charadriiformes |
| Family | Alcidae | Alcidae |
| Conservation Status | Near Threatened | Least Concern |
| Length | — | — |
| Wingspan | 24.2 cm (9.5 in) | 27.1 cm (10.7 in) |
| Weight | 175.0 g (6.17 oz) | 208.16666666666666 g (7.34 oz) |
| Diet | -- | -- |
| Clutch Size | 1 | 2 |
| Population Trend | — | — |
Habitat Comparison
Conservation Status
Near Threatened
Cassin's Auklet
Least Concern
Ancient Murrelet
About These Birds
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.
Ancient Murrelet
Ancient Murrelet, 24–27 cm, breeds in burrows on North Pacific islands from British Columbia to Japan. Black hood, grey back, white underparts with yellow bill. Nocturnal at colonies to avoid predators. Chicks lead-march to sea within days of hatching — abandoning the nest very early. Planktivore and piscivore.