Baby birds learn to fly. Baby mammals switch from milk to solid food. Baby bats, as winged mammals, do both at the same time during their transition from infants to flying juveniles. According to a new report from researchers at the Smithsonian Tropical Research Institute (STRI) who studied Peters’ tent-making bats (Uroderma bilobatum), mothers prod their young with their forearms, perhaps encouraging them to fledge and wean.