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Bat Sonar Signals: Why are they so varied?

• Why are bat signals longer-duration, tonal signals instead of clicks?

• Why do they go up and down in frequency?

• Why are they so varied?

• Investigating the forces that shaped the evolution of the variety of signals produced by bats is a whole field of study, involving acoustics, engineering (signal processing), maths, physiology and ecology.

• Find out more in Part 3: How does it Work?