Silver-haired bat (Lasionycteris noctivagans)

Description and distinguishing features

Silver-haired bats are compact and relatively heavy-bodied for their size. Adults typically have dark brown to blackish fur with silvery white tips on many hairs. Wings are broad, the ears are rounded and short, and they show the muscular shoulders typical of tree-roosting and maneuverable flyers. Their flight is relatively slow and agile, suited for pursuing prey along forest edges and beneath canopy cover.

Distribution and habitat

This species ranges widely: it occurs seasonally or year-round in parts of Canada, throughout much of the United States and into Mexico, and has been recorded on Bermuda. Silver-haired bats favor wooded landscapes—mature forests, riparian corridors and forest edges—where they forage and roost in tree cavities, under loose bark, in abandoned woodpecker holes, and occasionally in buildings.

Key characteristics at a glance:

• Color: dark with silvery-tipped hairs giving a frosted look.
• Size: small bat with a compact body and broad wings suited to maneuverable flight.
• Roosting: tree cavities and crevices; solitary or in small groups.
• Migration: many populations move seasonally, some overwintering farther south.

Behaviorally, silver-haired bats are principally nocturnal aerial insectivores. They take a wide range of flying insects—moths, beetles, and aquatic-emergent insects among them—using echolocation to locate and capture prey. They hunt close to vegetation and are adept at gleaning insects from surfaces as well as catching them on the wing.

Reproduction follows the general temperate-bat pattern: females form small maternity groupings in summer, give birth to one or occasionally two young, and raise pups until they can fly and feed independently. Many individuals migrate south in autumn; others may hibernate in sheltered sites. The species is listed as relatively secure across most of its range, though like many bats it can be affected by habitat loss, disturbance of roost sites, and broader threats such as white-nose syndrome in parts of its range.

For additional information and regional accounts, consult wildlife agencies and bat conservation organizations; field observers and researchers may also refer to regional species pages and identification keys for more details on calls, measurements and seasonal movements Mexico, Canada, and the United States. Human encounters are typically incidental; silver-haired bats are beneficial as insect predators and are protected by wildlife regulations in many jurisdictions. Further resources and surveys can be found through specialist databases and conservation groups Bermuda records and monitoring programs species reports, and general outreach pages genus profile and research summaries bat biology.