Certain mammals such as bats, dolphins, porpoises, and toothed whales use echlocation. “Mammals developed echolocation as an evolutionary response to night life or to life in dark, cloudy waters.” Bats, for example, developed this trait to be able to hunt for food at night since hunting during the day is made difficult having birds who are better flyers and extremely sharp-sighted as competition. In the case of marine mammals, this trait has enabled them to survive by being able to hunt for food more efficiently as well as escape faster predators such as sharks.
Cave swiftlets and oilbirds also use echolocation. Shrews also use a form of sonar to help find prey and their way through underground tunnels.
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