Polynesian Storm-Petrel vs Mottled Petrel

In short

The Polynesian Storm-Petrel and Mottled Petrel differ significantly in size and plumage patterns. The Polynesian Storm-Petrel is smaller with a distinctive dark plumage and white rump, while the Mottled Petrel is larger with a more uniform gray and mottled appearance. Observing size and plumage contrast is key to distinguishing these species.

Identification tips

1. Size: Note the smaller size of the Polynesian Storm-Petrel. 2. Plumage: Look for the white rump on the Polynesian Storm-Petrel. 3. Flight Pattern: Observe the fluttering flight of the Polynesian Storm-Petrel compared to the more direct flight of the Mottled Petrel. 4. Habitat: Consider the region; Polynesian Storm-Petrel in tropical waters, Mottled Petrel in temperate to subantarctic waters.

Size

The Polynesian Storm-Petrel is smaller and more compact compared to the larger and more robust Mottled Petrel.

Plumage

Polynesian Storm-Petrel has dark plumage with a contrasting white rump and underparts, while the Mottled Petrel has a more uniform gray and mottled appearance with no stark white rump.

Behaviour

Polynesian Storm-Petrel often exhibits a fluttering flight pattern, whereas the Mottled Petrel has a more direct and powerful flight.

Habitat

Polynesian Storm-Petrel is typically found in tropical and subtropical waters, while Mottled Petrel is more associated with subantarctic and temperate regions.

Voice

Vocalizations are not typically used for field identification due to the difficulty of hearing them at sea.