Sperm whales, just like bats, use echolocation to find prey. A sperm whale’s vocal syste...

Sperm whales, just like bats, use echolocation to find prey. A sperm whale’s vocal system creates a single sharp click, but the emitted sound consists of several equally spaced clicks of decreasing intensity. Researchers use the time interval between the clicks to estimate the size of the whale that created them. Explain how this might be done.

Hint: The head of a sperm whale is complex, with air pockets at either end.