Trindade Petrel vs Hawaiian Petrel

In short

Trindade Petrel and Hawaiian Petrel are both medium-sized seabirds with similar dark morphs, but they can be distinguished by subtle differences in plumage and structure. Trindade Petrel often shows a more contrasting underwing pattern, while Hawaiian Petrel has a more uniform dark underwing. Observing these birds in their respective habitats can also aid in identification.

Identification tips

1. Look for the underwing pattern: Trindade Petrel shows more contrast with a paler base. 2. Consider the location: Trindade Petrel is more likely in the South Atlantic, Hawaiian Petrel in the central Pacific. 3. Note any subtle differences in glossiness of the plumage, with Trindade Petrel appearing slightly more glossy.

Size

Both species are similar in size, typical of medium-sized petrels.

Plumage

Trindade Petrel typically has a more contrasting underwing pattern with a paler base and darker edges, while Hawaiian Petrel's underwing is more uniformly dark. The upperparts of Trindade Petrel may appear slightly more glossy compared to the duller Hawaiian Petrel.

Behaviour

Both species exhibit similar flight patterns typical of gadfly petrels, with dynamic, erratic flight and frequent gliding.

Habitat

Trindade Petrel is often found in the South Atlantic, particularly around Trindade Island, while Hawaiian Petrel is primarily found in the central Pacific, especially around the Hawaiian Islands.

Voice

Vocalizations are not typically used for field identification as both species are mostly silent at sea.