 They use these echoes to locate and identify the objects.Echolocation is used for navigation, foraging, and hunting in various environments.Echolocating animals include some mammals and a few birds; most notably Laurasiatheria especially some bat species and odontocetes (toothed whales and dolphins), but also in simpler forms in other groups such as shrews, and two cave dwelling bird groups, the so-called cave swiftlets in the genus "Aerodramus" (formerly "Collocalia") and the unrelated Oilbird "Steatornis caripensis".