Of Slovak mammals, the Otter is best adapted to life in the water. It has a slim, but brawny body.  The Otter is very agile, restless, and playful. Adult Otters can weigh 5 to 8 kg, with a body length of 570 to 800 mm, and a tail length of 270 to 500 mm. It has a striking, long body and short strong legs, a head with small ears, and a long tail. It also has swimming membranes between the fingers of its legs, touch hairs on the sides of its mouth, and its whole body is covered with thick and...