trinta-réis-de-bico-preto vs bewick's wren

The Gull-billed Tern and Bewick's Wren are easily distinguished by their size and habitat preferences. The Gull-billed Tern is a medium-sized tern with a stout black bill, while Bewick's Wren is a small songbird with a distinctive long tail and supercilium. They occupy very different environments, with the tern favoring open water and the wren preferring dense brush.

Look for the stout black bill and pale gray upperparts of the Gull-billed Tern. In contrast, note the small size, long tail, and white supercilium of Bewick's Wren.

The Gull-billed Tern is significantly larger than Bewick's Wren.

Gull-billed Tern has pale gray upperparts and a black cap in alternate plumage, while Bewick's Wren is brown with a prominent white supercilium.

Gull-billed Tern is typically found near water bodies, while Bewick's Wren inhabits open woodlands and thickets.