Millions of female bats rear their pups in Bracken Cave. ████████ ███ ███████ ███ █████ ███ ████ ████████ ██ █████ ██████ ████ ██████ ██ ██████ ██████ ███████ ████████ ████ ███ ███ ████ █████ ███ █████ █████ ███ █████ ████ █████ ██ ███████ ███ ████████ ███ █ ███ ███ ██████ ███████████ ███ ████ ██ ███ ██████ ████ ████ ██ ███ █████ █████ ████ ██ ██ █████ ████ ████ ██████ ███ ███ █████████ ███ ████ ██ ███ ████
The author starts by highlighting a phenomenon: though there are millions of mother bats living in Bracken Cave, and though they all leave the cave every night, the mothers are quickly reunited with their own pups when they return. Then, because bats can only find each other through their calls, and because pups cannot recognize their mothers' calls, the author hypothesizes that mother bats must be able to recognize their pups' calls to be reunited with them so quickly.
After highlighting the initial phenomenon, the author offers two premises that narrow down potential explanations for that phenomenon. Bats' calls are the only means they have of finding each other, which rules out the possibility that the bats find each other by smell or some other means. And pups cannot recognize their mothers' calls, which rules out the possibility that pups find their mothers rather than the other way around. By this process of elimination, the author concludes that the mother bats of Bracken Cave must be able to recognize their pups' calls.
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