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evening bat

(Nycticeius humeralis humeralis)


This is a rather small brown bat with short, sparse, dull brown fur. The average total length is 75-105 mm, and the weight 5-6 grams or 1/4-1/3 ounce. This species resembles a small big brown bat. The usual litter size is two young that are born in sex-segregated nursery colonies of up to several hundred in May and June. This species inhabits buildings, and tree cavities in the summer. It emerges to forage early. They are slow, with steady flight often higher in evening than later night. They are not a cave user, but individuals sometimes swarm by entrances with other species. The winter habitat is unsure. The population in one study had an average 2 year life span although several over 5 years were found.


The evening bats are known only from the eastern part of Virginia in the Coastal Plain and lower Piedmont Provinces, but further collection may show it to occur in the lower southwestern counties. They are suspected of migrating south but winter roosts are unknown. They use manmade structures and abandoned tree holes as roosts during the summer.


This bat is an insectivore and is known to eat a number of pest species while foraging over open fields. They start foraging about 1/2 hour before dusk.