Any of several species of North American lizards in the genus Sceloporus, especially the eastern fence lizard (Sceloporus undulatus), the western fence lizard (Sceloporus occidentalis), and the southwestern fence lizard (Sceloporus cowlesii)
Any of the various tropical and subtropical birds of the four genera Aerodramus, Hydrochous, Schoutedenapus, and Collocalia in the swift family, many of which can navigate in darkness using echolocation.