The genus is common to the northern half of both hemispheres, and its members burrow and hibernate.
Bats are social, nocturnal and they migrate to a warmer climate, or hibernate.
Those which inhabit temperate latitudes hibernate.
There are about twenty kinds of night-lizards, and many which hibernate.
In temperate climates the impregnated females hibernate during the winter in houses, cellars, stables, the trunks of trees, &c., coming out to lay their eggs in the spring.
