Believe it or not, Alaska has seven species of bat. The Little Brown Bat (Myotis lucifugus) is the most common. At only 3 to 4-1/2″ long, and a wingspan of 8-9″, the Little Brown Bat, lives up to its name.
Bats are not well studied in Alaska. Even the lifespan of the Little Brown Bat in the state is unknown, although they seem to average 10 years or so in the Yukon. One elderly Yukon Little Brown Bat was known to live 34 years.
They range from the Yukon River south throughout Alaska. The total population is not known, although it is not thought to be large, considering the territory. I have seen bats sweep overhead at the darkest time of our summer days, but I can not say that it is a common experience. We certainly have the mosquitos to keep them well fed, however.
Bats usually hibernate from September until May, although it is not a continual hibernation. They seem to wake up on warmer days to hunt, then return to hibernation. They will roost in caves, but these are not common in Alaska’s Interior. Natural weather-protected areas will offer a place to roost, as will attics and out buildings. So the scratching one hears from the attic isn’t always a red squirrel in Alaska, but might be a Little Brown Bat.