the.com/sonar
the bat invented it sixty million years before the navy filed a patent
means A system that uses sound waves bounced off objects to detect and locate things underwater, like submarines, fish, or the seafloor.
from An acronym, coined during World War II, from SOund Navigation And Ranging — modeled on the earlier 'radar' (radio detection and ranging). The British had their own wartime term, ASDIC, but the American 'sonar' won the linguistic war and stuck.
origindeveloped seriously to hunt submarines in WWI
whale weaponsperm whales emit clicks that can stun prey
echolocationsome blind humans navigate by clicking their tongues
deep reachsound travels miles farther underwater than light
loud deathnaval sonar has been linked to whale strandings