Aqueous bat (Myotis previous phylogenetic Kuhl, 1817) - This is a small bat. Body length is 45 – 55 mm, the distance between the ends of the wings outspread - 240 – 250 mm., body weight - 7 – 12 g. The upper part of the body brownish gray or brown, and lower - Grey. Snukutis rusvas, bright. From the size of similar Brandt and Bob pelėausių reddish faces at different. Juveniles have a black chin spot, many of which later disappears. Aqueous bat Myotis tribe has the shortest ears. Stated the longest life expectancy in the aqueous bat - 40 years.

Emitted ultrasound - 48 kHz (39,5 – 56,7). Eating flies well after the sun goes down and eat all night. Prey to the surface of the water, 5 – 20 cm above. Catching insects, from time to time on the water surface can snap up small fish.

It is usual to water bat , but can fly and away from water bodies. Territory, of residence, usually no more than 6 km skersmens, but living in the canals or streams and can fly 10 linear miles of water from. During the summer, alone or in small, 5 – 15 individuals living in the hollows of trees in colonies, which can be high in the trees Lajose, receiver, very rarely - nesting-boxes, crevices of wooden buildings, po tiltais, found between. Avoid sunshine, solar heated seats. Close migrant - usually he is wintering in the fly 100 km, and registered the longest route in the Czech Republic - 240 km. Wet winter in a positive temperature underground walls, palubėse, eyelet. Often aqueous pelėausių are įsimaišiusių between Brandt pelėausių.

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