Murphy's Petrel vs Mottled Petrel

In short

Murphy's Petrel and Mottled Petrel can be challenging to differentiate at sea due to their similar size and flight patterns. However, plumage differences are key: Murphy's Petrel is generally darker and more uniform, while Mottled Petrel shows a distinctive mottled pattern on its back and upper wings. Observing these differences in good light is crucial.

Identification tips

1. Look for the mottled pattern on the back and wings of the Mottled Petrel, especially in good light. 2. Note the overall darker and more uniform plumage of Murphy's Petrel. 3. Use plumage rather than size or behavior to distinguish these species at sea.

Size

Both species are similar in size, typical of medium-sized petrels, making size an unreliable differentiator.

Plumage

Murphy's Petrel has a more uniform dark gray plumage, whereas Mottled Petrel is characterized by a mottled gray and white pattern on the back and upper wings. The Mottled Petrel also has a paler face and underparts compared to the darker overall tone of Murphy's Petrel.

Behaviour

Both species exhibit similar flight patterns typical of petrels, with dynamic, gliding flight interspersed with rapid wingbeats. Behavior is not a reliable differentiator.

Habitat

Both species are pelagic and are typically found far from land, often in similar oceanic regions, making habitat an unreliable field mark.

Voice

Vocalizations are rarely heard at sea and are not a practical field mark for differentiating these species.