There’s a cave in Texas with more bats than most cities have people… and it’s officially the largest bat colony in the world.Hidden in plain sight just outside of San Antonio is Bracken Cave Preserve, home to the largest bat colony on Earth. More than 15 million Mexican free-tailed bats pack into this limestone cave every year. That number alone is mind-blowing, but what happens inside the cave might be even more incredible. Around February, the bats fly into Texas and transform caves into nurseries. The female bats give birth to tiny pups that survive on incredibly rich milk produced in mammary glands located beneath each wing. That nutrient-dense milk helps the babies grow fast, so fast that many are ready to fly just four to five weeks after being born…