Stejneger's Petrel vs Pycroft's Petrel

Stejneger's Petrel and Pycroft's Petrel can be challenging to distinguish, but key differences in plumage and behavior can aid identification. Stejneger's Petrel is noted for its distinct blackish hood and 'M' pattern on the upper wings, while Pycroft's Petrel lacks these features. Observing their behavior and preferred habitats can also provide clues.

Look for the blackish hood and 'M' pattern on Stejneger's Petrel. Consider the location and season: Stejneger's is more likely in the North Pacific, especially near Asia, outside the breeding season. Pycroft's Petrel is more uniformly grey and stays closer to its breeding areas.

Both species are similar in size, typical of small petrels, making size a less reliable distinguishing feature.

Stejneger's Petrel has a blackish hood contrasting with a blue-grey back and a well-marked 'M' pattern on the upper wings. Pycroft's Petrel lacks the blackish hood and 'M' pattern, generally appearing more uniformly grey.

Stejneger's Petrel is a trans-equatorial migrant, often seen in the temperate North Pacific during the non-breeding season. Pycroft's Petrel's behavior is less documented but generally remains closer to its breeding grounds.

Stejneger's Petrel is more likely to be found offshore in the North Pacific, particularly near Asia, while Pycroft's Petrel is more localized around its breeding islands.