Bat

Bats are the only mammals that can fly. They are found all over the world except the polar regions. All 16 species of bats found in Latvia feed only on insects and are active at night. Bats navigate using ultrasound. In flight, they emit short ultrasonic calls of only a few milliseconds in the range of 20–60 kHz, which echo off both obstacles and food objects. In winter, when insects do not fly, some species of bats migrate south, while others hibernate in caves, cellars and attics.