Blue Whale

The Blue Whale is believed to be the largest animal to have ever lived, with the largest extinct Dinosaurs believed to overcome the blue whale in terms of Length,but not in weight. The maximum recorded weight was 190 tonnes for a specimen measuring 30 m (98 ft),while longer ones,up to 33.3 m (109 ft),have been recorded but not weighed.
A Blue Whale's tongue weighs around 2.7 tonnes and when fully expanded,its mouth is large enough to hold up to 90 tonnes of food and water.Despite the size of its mouth, the dimensions of its throat are such that it cannot swallow an object wider than a beach ball.Its heart weighs 600 kg(1,320 lb) and is the largest known in any animal.A Blue Whale's aorta is about 23 cm (9 in) in diameter.A human could crawl through the aorta(a major blood vessel).During the first seven months of its life,a Blue Whale calf drinks approximately 400 litres(100 US gallons) of milk every day.Blue Whale calves gain weight quickly,as much as 90 kg (200 lb) every 24 hours. Even at birth,they weigh up to 2,700 kilograms (6,000 lb)the same as a fully grown hippopotamus.Blue Whales eat tiny organisms like plankton and krill.