Silver-Haired Bat, Lasionycteris noctivagans

The silver-haired bat (Lasionycteris noctivagans) is the only species in the genus Lasionycteris within the large family of vesper bats. It can be found in the United States, Mexico, Canada, and Bermuda. Also known as silverwings, this bat is the most common in the forests of the United Sates. The bats are almost black in color with dense, silver tipped fur that makes them look “frosted”. At approximately 3.9 inches, this bat is considered medium sized. It can weigh up to .4 ounces. It feeds on insects like beetles, moths, and flies and often times forages on the ground.

The silver-haired bat is slightly migratory, spending its winters in the south and its summers in the north. Males and females will separate for migrating seasons, but it is not yet certain where the bats go during winter. It is thought that they may hibernate at their breeding grounds, but a number of insufficient records causes some mystery. Most records of summer migration show that, in the southwest, mostly males inhabit the area. This may suggest that a separation of sexes occurs during the summer. In those hotter months, females will move north during spring to give birth to litters of up to two pups. Small maternity colonies have been found in abandoned bird nests and hollow trees.

Image Caption: Silver-haired Bat (Lasionycteris noctivagans). Credit: NPS/Wikipedia

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