Linked from
The 62 pages that link to Echolocation, each with the reason it gives.
Aquatic animalRelated: Toothed whales use it to find prey and orient in dark or murky water.
MesoplodonRelated: These toothed whales use biosonar to find prey in dark deep water.
BatRelated: Many bats use echoes from their calls to detect obstacles and locate prey.
VespertilionidaeRelated: Many vesper bats use calls and echoes to find prey and orient in darkness.