Sterne diamant vs Pétrel de Tahiti

The Black-naped Tern and Tahiti Petrel are distinct in both structure and behavior. The tern is a smaller, more agile bird with a slender build, while the petrel is larger with a plumper body and more languid flight. Observing their flight patterns and body shape is key to distinguishing these species.

1. Size and Structure: The tern is smaller and more slender; the petrel is larger and plumper. 2. Flight Pattern: Look for quick, agile flight in the tern versus languid, swooping glides in the petrel.

The Black-naped Tern is considerably smaller than the Tahiti Petrel.

The Black-naped Tern flies with quick, agile movements, whereas the Tahiti Petrel exhibits looser, more elastic wingbeats and longer, swooping glides.