āWhile bats can only sense the outer shapes and textures of their targets, dolphins can peer inside theirs. If a dolphin echolocates on you, it will perceive your lungs and your skeleton. It can likely sense shrapnel in war veterans and fetuses in pregnant women. It can pick out the air-filled swim bladders that allow fish, their main prey, to control their buoyancy.
It can almost certainly tell different species apart based on the shape of those air bladders. And it can tell if a fish has something weird inside it, like a metal hook. In Hawaii, false killer whales often pluck tuna off fishing lines, and ātheyāll know where the hook is inside that fish,ā Aude Pacini, who studies these animals, tells me. āThey can āseeā things that you and I would never consider unless we had an X-ray machine or an MRI scanner.ā
This penetrating perception is so unusual that scientists have barely begun to consider its implications. The beaked whales, for example, are odontocetes that look dolphin-esque on the outsideābut on the inside, their skulls bear a strange assortment of crests, ridges, and bumps, many of which are only found in males.
Pavel Golādin has suggested that these structures might be the equivalent of deer antlersāshowy ornaments that are used to attract mates. Such ornaments would normally protrude from the body in a visible and conspicuous way, but thatās unnecessary for animals that are living medical scanners.ā
-Ed Yong, An Immense World
