Eastern Pipistrelle

Perimyotis subflavus (Pipistrellus subflavus)
Vespertilionidae (evening bats) in the order Chiroptera

Eastern pipistrelles are relatively small and are pale yellowish or pale reddish-brown. In caves, they are often covered with dew drops. This species is usually found roosting singly, sometimes in pairs and rarely in clusters of up to a few to a dozen bats. The forearms are distinctly pink and contrast strongly with the black wing membranes. Ears are small, and the tip of the tragus is rounded. They posture typically appears hunched or rounded. They are common in winter.

Total length: 3–3½ inches; tail length: 1½–1¾ inches; weight: 1/10–2/7 ounces (2–8 g).
Habitat and conservation: 
Bats of this species can be found hibernating singly in most caves in Missouri. In our state, most pipistrelles hibernate in winter in the most humid and warm parts. In summer, they roost in trees, in crannies about cliffs or buildings, in barns or sometimes in high domes of caves. Do not disturb roosting bats, and do not handle them.
This small bat feeds on tiny insects, particularly flies, moths, wasps, leafhoppers and beetles, many of which are aquatic forms. Compared to other bats, pipistrelles appear weak fliers, flying with a fluttering motion in an undulating course. They begin feeding about sundown, with other feeding periods toward midnight and near daylight. They generally forage high over watercourses at the forest edge.
Distribution in Missouri: 
Common, but declining.
Life cycle: 
Mating occurs in fall, intermittently throughout winter and again in spring. Relatively small maternity colonies start forming in mid-April. The 1 or 2 (rarely 3) young are born from late May to mid-July, after a gestation period of at least 44–60 days. The young are able to fly at about 4 weeks of age. They probably do not mate in the year of their birth.
Human connections: 
Bats help control insects, some of which are agricultural pests or are annoying to man (such as mosquitoes). Bats have contributed much to human knowledge through scientific studies of their echolocation, biology and physiology. Bats are protected by both state and federal laws.
Ecosystem connections: 
As predators, bats help to hold insect populations in balance; also, many forms of cave-dwelling life depend on the nutrients brought in by bats and released from their guano (feces).
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