Pycroft's Petrel vs Blue Petrel

Pycroft's Petrel and Blue Petrel can be distinguished by their plumage and structural features. Pycroft's Petrel has a more uniform gray upperwing, while Blue Petrel shows a distinct 'M' pattern across its wings. Both species are small petrels but differ in tail and wing markings.

Look for the 'M' pattern on the upperwings and white-tipped tail to identify Blue Petrel. Pycroft's Petrel will have a more uniform gray upperwing without these distinctive markings.

Pycroft's Petrel has a more uniform gray upperwing, whereas Blue Petrel displays a distinctive 'M' pattern on its upperwings. Blue Petrel also has a white-tipped tail, which is not present in Pycroft's Petrel.