Toothed Whale uses Bisonar system

Echolocation evolved in aquatic mammals about 30 million years ago during the Eocene period. Whales and other aquatic mammals like Dolphins, Seal, Porpoise etc use Ultra sound for navigation and predation. Whales live in an environment that has acoustic characters but with low visibility due to the turbidity of water. So they use the sonar mechanism for navigation. Whales, especially Toothed whale uses Bisonar system for echolocation. Bisonar in toothed whale uses two frequencies like FM and CF for locating the objects. Sonar is a system that detects objects through sound waves. The word SONAR is the acronym for SOund Navigation And Ranging.

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Bat uses FM Frequency

Echolocation is the biological sonar system used by some animals to navigate or locating prey. They emit ultrasounds in various frequencies that reflect back from the objects. These animals have special ear and brain adaptations to detect the reflected sound. Echolocation is found in animals like Bats, Toothed Whales, Shrews, Dolphins and in some birds. The interesting feature is that Bats emit FM frequencies for precise range discrimination and localization of the target.

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