Parkinson's Petrel vs Streaked Shearwater

In short

Parkinson's Petrel and Streaked Shearwater can be distinguished primarily by their plumage and structural differences. Parkinson's Petrel is uniformly dark, while Streaked Shearwater has a distinctive streaked pattern on its upperparts and a paler underbelly. Both species belong to the same family but differ in size and behavior.

Identification tips

1. Look for the uniform dark plumage of Parkinson's Petrel versus the streaked upperparts and pale underbelly of Streaked Shearwater. 2. Note the size and structure: Parkinson's Petrel is more compact, while Streaked Shearwater is larger and more elongated. 3. Observe behavior: Streaked Shearwater may be seen in larger flocks, especially during migration.

Size

Parkinson's Petrel is slightly smaller and more compact compared to the larger and more elongated Streaked Shearwater.

Plumage

Parkinson's Petrel is mostly dark with a uniform sooty-black plumage. In contrast, the Streaked Shearwater features a streaked brown and white pattern on its upperparts and a pale underbelly, making it more contrasting in appearance.

Behaviour

Both species are pelagic and often seen gliding over the ocean, but Streaked Shearwater may be more likely to be seen in large flocks, especially during migration.

Habitat

Both species are oceanic, but Streaked Shearwater is more commonly found in the North Pacific, while Parkinson's Petrel is typically seen in the South Pacific.

Voice

Vocalizations are not a primary distinguishing feature in the field for these species, and specific differences are not well-documented.