At 170 to 200 tons, the blue whale is larger than any dinosaur known to have lived. The largest dinosaur lived in the Mesozoic Era and was the Argentinosaurus, which weighed up to 99 tons.
Although it is difficult to obtain an accurate measurement of a blue whale due to their enormous size, scientists estimate the majority of these animals are between 90 and 98 feet in length. Generally, the Argentinosaurus was slightly longer than the blue whale, but in terms of weight, the blue whale is considered to be larger than any other animal that has lived on the planet.
Blue whales eat roughly 4 tons of krill each day. Even baby blue whales can weight 3 tons at birth. The blue whale's heart weighs as much as a fully-grown elephant, and its brain weighs around 15 pounds. Its skull is an astounding 19 feet long.