Common Tern vs Roseate Tern

In short

The Common Tern and Roseate Tern are similar in size and structure, but can be distinguished by their plumage and vocalizations. The Common Tern has a more robust build with a darker cap and a black-tipped red bill, while the Roseate Tern is more slender with a paler cap and a mostly black bill. Their calls also differ, with the Roseate Tern having a distinctive grating call.

Identification tips

• Look for the bill color: Common Tern has a black-tipped red bill, while Roseate Tern has a mostly black bill.
• Check the cap color: Common Tern has a darker cap compared to the paler cap of the Roseate Tern.
• Listen for the calls: Common Tern has a typical tern call, whereas the Roseate Tern has a grating call.
• Observe the body shape: Roseate Tern is more slender and delicate compared to the robust Common Tern.
• Note any pinkish hue on the underparts of the Roseate Tern, especially in fresh plumage.

Size

Both species are similar in size, but the Roseate Tern appears more slender and delicate compared to the more robust Common Tern.

Plumage

The Common Tern has a darker cap and a black-tipped red bill, while the Roseate Tern features a paler cap and a mostly black bill. The Roseate Tern may also show a faint pinkish hue on its underparts in fresh plumage, which the Common Tern lacks.

Behaviour

Both species exhibit similar foraging and flight behaviors, but the Roseate Tern's 'gakkering' threat display is unique among terns.

Habitat

While both species can be found in coastal areas, the Roseate Tern is more often associated with tropical and subtropical regions, whereas the Common Tern has a broader range including temperate zones.

Voice

The Common Tern has a more typical tern call, while the Roseate Tern's call is a distinctive grating sound, setting it apart from the Common Tern.