SPENCER SUTTON / SCIENCE PHOTO LIBRARY SPENCER SUTTON / SCIENCE PHOTO LIBRARY
Biological sonar of bats. The yellow half circles show the series of high-pitched sounds that many bats emit to help them navigate when flying at night, and to detect and capture their prey. The sounds reflected off surrounding objects are detected by well-developed organs in the inner ear used for echolocation. Bats with this refined sense of echolocation usually also have large external ears.
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