Scientists believe that some farthest-north bats spend the winter in Alaska, but aren’t certain exactly where they stay.
On Joint Base Elmendorf-Richardson in 2018, biologist Jesika Reimer releases a little brown bat with a radio transmitter on its back.
Mama bats, now hanging out there in some unknown space, are storing the sperm they received during mating swarms. If things go well this winter, the females will emerge next spring with a tiny fetus growing within them. They have only one pup each summer. But Reimer and other biologists found bat maternity colonies away from buildings. In the Copper River Valley, Reimer and her co-workers in summer 2017 radio-tagged mother bats at their cabin roost. When later tracking them with handheld receivers, they found the mother bats did not return to the cabin.
“Large maternity colonies in trees shoots down the theory that bats only came to Alaska as buildings went up,” she said.
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