Big Brown Bat

Eptesicus fuscus

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Eptesicus fuscus

The Big Brown Bat is a relatively large flying bat compared to others the length: 10-13 cm (3.9-5.5 in), tail: 4-5 cm (1.5-1.9 in), mass: 13-18 g (0.0397 lbs).


The Big Brown Bat (Eptesicus fuscus) is native to North America, Central America, the Caribbean, and extreme northern South America. (Shown in the image below, grey area)
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Behavior


Big brown bats are Insectivore which means their diet consists of flying insects including moths, flies, wasps, flying ants, lacewings, and dragonflies.

Some bat species in other countries eat fruit, nectar or fish. Vampire bats, a small group that lives in Central and South America, feed on animal blood.



Big brown bats utilize echolocation to avoid obstacles and to capture flying insect prey. Big Brown Bats can see well, but rely more on sound than sight. (Bat sound down below)

Lennart Schaaf

Big Brown Bat chirp/sound by Lennart Schaaf

Bat life

Big brown bats mate during the fall and winter before they go into hibernation, but the female does not become pregnant until the spring as she stores the sperm during hibernation. In late May or early June she gives birth to one or two pups. The babies are born blind, with no fur and completely depend on their mother for nourishment. They grow quickly and are able to fly within a month to six weeks.


Big brown bats can live up to 18-20 years in the wild. Unfortunately most big brown bats die during their first winter as they did not store enough fat to survive their entire hibernation period.


Big brown bats fly more then they walk and land most of the time on higher structures so their track is hard to find. It is however shown in the image below.

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In this video they feed a Big Brown Bat. (Start at 3:00)

Late Night 'Rob Mies & His Vampire Bat Friends! 10/22/04

Fun fact

Big brown bats are reported to be one of the fastest bats reaching speeds of up to 40 mph.

In this silhouette it shows the parts of the Big Brown Bat.

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Habitat

The big brown bat is found in almost all habitats from deserts, meadows, cities, to forests, mountains and chaparral.