Ancient Murrelet vs Scripps's Murrelet

In short

Ancient Murrelet and Scripps's Murrelet are both small seabirds of the genus Synthliboramphus, but they can be distinguished by differences in plumage and habitat preferences. Ancient Murrelets are more widespread in the northern Pacific, while Scripps's Murrelets are found further south, particularly around the California Channel Islands.

Identification tips

• Location: Check geographic range; Ancient Murrelets are more northern.
• Plumage: Look for the white eye line in Ancient Murrelets.
• Habitat: Consider nesting sites; Scripps's prefer rock caves or dense shrubs.
• Behavior: Note nocturnal activity in Ancient Murrelets.

Size

Both species are similar in size, typical of small alcids, with no significant differences noted in field observations.

Plumage

Ancient Murrelets have a distinctive black head with a white throat and a white line extending from the eye, whereas Scripps's Murrelets have a more uniform dark upper body and a clean white underbody without the eye line.

Behaviour

Both species exhibit similar behaviors, with young leaving the nest shortly after hatching to be reared at sea. However, Ancient Murrelets are known for their nocturnal colony visits.

Habitat

Ancient Murrelets are found around the northern Pacific rim, from China to British Columbia, often near land where tidal upwellings occur. Scripps's Murrelets are more localized to the California Channel Islands and Baja California, nesting in rock caves or under dense shrubs.

Voice

Ancient Murrelets have a diverse vocal repertoire associated with their nocturnal activities, while specific vocalization details for Scripps's Murrelet are less documented.