The Hoary Bat, Lasiurus cinereus, is a species of bat in the family of vesper bats known as Vespertilionidae. This is a migratory bat and may travel from Canada as far south as the southern United States or Bermuda.
Occasionally the bat will roost inside shipping crates and this may account for reports of them being observed above the Arctic Circle.
The hoary bat averages 5 to 5.7 inches long with a 15.7 inch wingspan. It weighs only 0.9 ounces. However, it is the largest bat normally found in Canada. Its coat is dark brown in color and there is silver frosting on the animals back. With the exception of the underside of the wings most of the bat is covered in fur.
This bat normally roosts alone in mainly in trees, but has been found in caves as well. It prefers woodland, mainly coniferous forests but hunts over open areas or lakes. It hunts alone and its main food source is moths, but will also eat dragonflies.
Little is known about the reproductive cycle of the hoary bat, but it is thought that they mate in August and give birth in June of the following year. Litters range from 1 to 4 and the young spend about 1 month with the mother before leaving and fending for themselves.