The blue whale is the largest animal on Earth. It is also the loudest animal on Earth. These enormous mammals eat tiny organism, like plankton and krill, which thay sift through baleen (a horny substance attached to the upper jaw). The grey – blue whales have 3 blowholes and a 2-14 inch (5-30 cm) thick layer of blubber. The grooves allow their throat to expand during the huge intake of water during feeding. Blue whales have 50-70 throat grooves that run from the throat to mid- body.
The largest mammal is the African elephant which can weigh up to 7 tonnes (6.9 tons)