Charrán Lunado vs Charrán de Sumatra

The Grey-backed Tern and Black-naped Tern can be distinguished by their plumage and behavior. The Grey-backed Tern is known for its grey back, while the Black-naped Tern features a distinctive black nape. Observing their behavior and preferred habitats can also aid in identification.

Look for the grey back of the Grey-backed Tern and the black nape of the Black-naped Tern. Note the shyness of the Grey-backed Tern, which may help in distinguishing it from the more approachable Black-naped Tern.

The Grey-backed Tern has a grey back, which is a key distinguishing feature. In contrast, the Black-naped Tern is characterized by a black nape, which stands out against its otherwise lighter plumage.

The Grey-backed Tern is considerably shier and rarer compared to the Black-naped Tern.

The Grey-backed Tern is primarily found in the central Pacific Ocean, breeding on small, remote islands and atolls. The habitat preferences of the Black-naped Tern are not detailed in the notes.