This is the Hawaiian Horay Bat.I was walking around at night and noticed this thing flying around in circles, I have never seen something like this before. Its fur is long and soft, dark brown to black at the base. This mammal is endangered. It is a member of the Family Vespertilionidae. Hawaiian bats forage for flying insects, primarily in the early evening hours. Typically it feeds over streams, bays, or along the seacoast. Others are seen feeding at the junction of forests and open pastures, or over lava flows. This bat roast alone in fields or trees. The reproductive cycle of the hoary bat is not yet fully documented, but it is thought that they mate in August with birth occurring in June of the following year. A litter ranges from 1-2 pups and the young spend about one month with the mother before being able to fend for themselves.
Like other members of the family Vespertilionidae, the hoary bat has a unique bony tail that they use as a sort of feeder. Birds and snakes are their most likely predators