Bridled Tern vs Grey-backed Tern

In short

The Bridled Tern and Grey-backed Tern are both members of the Onychoprion genus, but they can be distinguished by their plumage and preferred habitats. The Bridled Tern has a more extensive range and is often seen near land, while the Grey-backed Tern is primarily found in the central Pacific and is shyer.

Identification tips

1. Look for the white supercilium and darker cap of the Bridled Tern. 2. Note the grey back of the Grey-backed Tern, which lacks the Bridled Tern's distinct facial markings. 3. Consider habitat: Bridled Terns are more likely near coastlines, while Grey-backed Terns are typically on remote Pacific islands.

Size

Both species are similar in size, typical of medium-sized terns.

Plumage

The Bridled Tern has a distinctive dark cap and a white forehead with a narrow white supercilium, contrasting with its grey upperparts. The Grey-backed Tern, as its name suggests, has a grey back and a paler head, lacking the distinct white supercilium of the Bridled Tern.

Behaviour

Bridled Terns are more likely to be seen near land and do not typically feed in large flocks. Grey-backed Terns are shyer and often found in remote island colonies, sometimes driven away by more aggressive species like Sooty Terns.

Habitat

Bridled Terns are found in tropical and subtropical waters worldwide, often near land. Grey-backed Terns are more localized to the central Pacific, breeding on remote islands and atolls.