Myotis nigricans

Myotis nigricans

Adult bats of the species have a body length of 4 cm, a 3cm forearm and weigh approximately 4 g. The dorsal colouration is brown, varying geographically from light to dark, with a ventral colour similar to the back. They form groups ranging in size from less than 10 individuals to more than 300 and are found in caves, the hollows and bark of trees, cracks in rocks and thick foliage. They are widely found in anthropized areas, sheltering in the roofs of buildings, shutter boxes and air-conditioning ducts.

They are bats that forage in forests and clearings, presenting variation in their prey capture. There are records of the consumption of insects of the orders Efemeroptera, Diptera, Lepidoptera and Coleoptera, but also of organisms of the order Araneae. The calling pulse has an initial modulated frequency, with a final tail of quasi-constant frequency. The final pulse rate is between 45-50 kHz.
 
Its distribution includes Mexico, Central America and, all South American countries except Chile and Uruguay.

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