Echolocation refers to an animal's use of sound reflections to localize objects and to orient in the environment. Echolocating animals transmit acoustic signals and process information contained in the reflected signals, allowing the detection, localization, and identification of objects by sound. Echolocation has been documented in bats, marine mammals, some species of nocturnal birds, and to a limited extent in blind or blindfolded humans. Specialized perceptual and neural processes for echolocation have been detailed only for bats and dolphins.