- any of several swifts of the genus Collocalia, of southeastern Asia, the East Indies, and Australia, certain species of which use saliva to construct nests, which are used in making bird's-nest soup.
- any of various small swifts of the Asian genus Collocalia that often live in caves and use echolocation: the nests, which are made of hardened saliva, are used in oriental cookery to make birds' nest soup
