Pétrel diablotin vs Pétrel à col blanc

The Black-capped Petrel and White-necked Petrel can be distinguished by their head markings and underwing patterns. The Black-capped Petrel typically has a distinctive black cap and a contrasting white face, while the White-necked Petrel features a more uniform gray head with a white nape.

Look for the black cap on the Black-capped Petrel and the white nape on the White-necked Petrel. Check underwing patterns for contrast differences.

The Black-capped Petrel is characterized by a black cap and white face, whereas the White-necked Petrel has a gray head with a white nape. Underwing patterns also differ, with the Black-capped Petrel showing more contrast between dark and light areas.