Fairy Prion vs Salvin's Prion

In short

Fairy Prion and Salvin's Prion are similar seabirds, both belonging to the genus Pachyptila, making them challenging to distinguish. The most reliable field mark is the bill structure: Fairy Prion has a relatively slender bill, while Salvin's Prion features a broader bill. Observing these species in their respective habitats can also aid identification.

Identification tips

• Bill shape: Look for the slender bill of the Fairy Prion versus the broader bill of Salvin's Prion.
• Plumage pattern: Note the more pronounced 'M' pattern on Salvin's Prion.
• Size: Salvin's Prion is slightly larger, though this can be hard to judge without direct comparison.
• Location: Consider geographic location and water temperature, especially outside the breeding season.

Size

Both species are similar in size, but Salvin's Prion is slightly larger overall.

Plumage

Both have gray upperparts with a black diagonal band across the wings, typical of prions. However, Salvin's Prion may appear slightly darker and have a more prominent 'M' pattern on the upper wings.

Behaviour

Both species exhibit similar foraging behaviors, such as surface-seizing and dipping. They are highly colonial and nest in burrows on oceanic islands.

Habitat

Fairy Prion is typically found in temperate and subtropical waters post-breeding, while Salvin's Prion may be encountered in slightly more southern waters, though there is overlap.

Voice

Vocalizations are similar and not a reliable distinguishing feature in the field.