the.com/biosonar

Seeing with sound because light gave up on caves and oceans.

means A biological echolocation system — used by animals like bats and dolphins — that builds a picture of the world by emitting sounds and reading the returning echoes.

from A straightforward 20th-century compound: 'bio-' (Greek bios, life) stitched onto 'sonar,' itself an acronym for SOund Navigation And Ranging, coined around World War II for the technology ships and submarines used to detect objects underwater. Once scientists realized bats and dolphins were doing something strikingly similar with their own bodies, 'biosonar' followed naturally — the machine's name loaned back to nature, which had been running the original version for millions of years first.

origin
evolved independently in bats and whales
resolution
bats detect wires thinner than human hair
range
sperm whale clicks are loudest sounds in nature
mechanism
brain reads echo delay to build 3d map
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