Echolocation: Bats, Dolphins and Whales

Context: A new study has revealed how bats use adjusted echolocation to avoid collisions when flying in large groups.

What is Echolocation?

Echolocation is a form of biological sonar employed by some animals—like bats, dolphins, whales, and some birds and shrews—to navigate, find prey, and perceive their environment.

How Echolocation Works?

• The animal produces high-frequency sound waves.
• The sound waves reflect off objects and come back as echoes.
• By interpreting the echoes, the animal calculates the distance, size, shape, and texture of objects, and their movement and direction.

How Do Bats Avoid Crashing?

• Bats use sound (echolocation) to fly safely.
• When too many bats echolocate together, their sounds get mixed up, this leads to a phenomenon called echolocation jamming.
• Despite the intense jamming, bats avoid mid-air collisions by adapting their behaviour and echolocation strategy. The two strategies are:
  • Spreading out to reduce density.
  • Shorter, weaker, higher-frequency calls.

Other Animals That Use Echolocation

• Dolphins – To find fish and navigate underwater.
• Toothed Whales – To hunt prey and avoid obstacles.
• Oilbirds & Swiftlets – To fly through dark caves.

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