Antarctic Prion vs White-chinned Petrel

In short

The Antarctic Prion and White-chinned Petrel are both seabirds of the Southern Ocean, but they differ significantly in size and bill structure. The Antarctic Prion is smaller with a slender bill, while the White-chinned Petrel is larger with a distinctive pale bill and a white chin patch.

Identification tips

1. Size: Use size as a primary indicator; the White-chinned Petrel is larger. 2. Bill: Look for the pale, large bill of the White-chinned Petrel compared to the slender bill of the Antarctic Prion. 3. Chin Patch: The White-chinned Petrel has a distinctive white chin patch, absent in the Antarctic Prion. 4. Behavior: Note if the bird is following ships, which suggests White-chinned Petrel.

Size

The White-chinned Petrel is significantly larger than the Antarctic Prion.

Plumage

The Antarctic Prion has a more uniform grey and white plumage, while the White-chinned Petrel features a notable white chin patch and a darker overall appearance.

Behaviour

Both species are often seen at sea, but the White-chinned Petrel is known to follow ships, which is less typical for the Antarctic Prion.

Habitat

Both species inhabit the Southern Ocean, but the White-chinned Petrel breeds on subantarctic islands and can be found further north during non-breeding seasons.