Bats of Connecticut
- genera
- Bats that occupy buildings
- little brown bat (Myotis lucifugus) — common and widespread in the state This and the big brown bat are the two most common bat species in the state
- big brown bat (Eptesicus fuscus) — winters in the state, often hibernating in buildings, occasionally caves; a bat seen in winter is probably this species; in summer it often roosts in attics; it breeds in the state.
- Bats that roost in trees in summer
- silver-haired bat (Lasionycteris noctivagans) — uncommon; usually seen near water; listed as a Connecticut species of special concern
- eastern red bat, red bat (Lasiurus borealis) — usually found at lower elevations; seldom seen and listed as a Connecticut species of special concern
- hoary bat (Lasiurus cinereus) — seldom seen and listed as a Connecticut species of special concern
- northern long-eared myotis, northern bat, also known as the long-eared bat (Myotis septentrionalis)
- Bats that hibernate in caves and tunnels
- northern long-eared myotis (see above)
- little brown bat (see above)
- eastern small-footed bat, small-footed bat (Myotis leibii) — believed to have been extirpated in the state, and it was probably always scarce; no confirmed sightings have been recorded in the state for several decades; listed by the state as a "species of special concern"<
- Indiana bat (Myotis sodalis) — in the several decades up to 2004, only one was ever found in the state
- eastern pipistrelle (Perimyotis subflavus, also called Pipistrellus subflavus