Dark against the autumn sky, its branches broken and twisted, with mysterious black holes and cracks in its bark, a dead tree might seem spooky. But to many animals, it’s home. Bats, screech owls, ...

Bats that weigh no more than a handful of coins screech 100 times louder than rock concerts, a discovery that could help design advanced robots. Not only are bats the only mammals that can truly fly, ...