taperuçu-de-coleira-branca vs andorinhão-do-temporal

The White-collared Swift (Streptoprocne zonaris) is larger and more robust, with a distinctive white collar, while Sick's Swift (Chaetura meridionalis) is smaller and entirely brown. These differences in size and plumage are the most reliable field marks for distinguishing between the two species.

1. Size: Look for the larger size of the White-collared Swift compared to the smaller Sick's Swift. 2. Plumage: Check for the white collar on the White-collared Swift, absent in the entirely brown Sick's Swift.

White-collared Swift is larger and more robust compared to the smaller Sick's Swift.

White-collared Swift has a distinctive white collar, whereas Sick's Swift is entirely brown.