Sounds like a scary horror movie? Believe it or not,this scene takes place all summer long,at Bracken Cave in Texas,where 20 million bats come out to feed on insects every
night.“It is magical,”says Jim Kennedy of Bat Conservation International in Texas.“It is one of the most impressive animal movements on the planet.”
Every March or April,Mexican free-tailed bats migrate up to 1,600 kilometers from
their winter home in Mexico to their American home in Texas,where they raise their
young.Soon after they arrive,each mother gives birth to one baby.As many as 500 baby
bats crowd into 30 cubic centimeters of space,and all those bodies create nice warm temperatures to keep them cozy and comfortable.
If you have ever lost sight of your parents in a crowded playground,you may be wondering how mother bats recognize their children.They use their sense of smell to tell which baby is theirs when it is time for the babies to have milk.
When twenty million bats fly out of one cave opening,they make a column so thick
that they show up on the radar at the nearby airport.It can take three hours for all of them
to get out from the cave.“You can feel the breeze from their wings,and see the plants waving,”says Kennedy.“The movement of all those wings makes a very relaxing soft sound.I've always thought it would make a great relaxation music to help you go to sleep.So much
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