generic structure "whales"

Whales


General classification : Whales are sea-living mammals
Description : they therofore breathe air but cannot survive on land .
Large indeed and the blue whale , wich can exceed 30m in leghth , is the largest animal to have lived on earth .superficially , the whale looks rather like a fish , but there are important differences in its external structure : it tail consist of a pair broad , flat , horizontal ,paddles (the tail of a fish is vertical ) and it has a single nostril on top of its large , broad head . the skin is smooth and shiny and beneath it lies a layer of fat (bubbler). This is up to 30 cm in thickness and serves to conserve nead and bodu fluids .