Wiktionary(0.00 / 0 votes)Rate this definition: mutant(Noun) Something which has mutated, which has one or more new characteristics from a mutation. mutant(Noun) Someone or something that seems strange, abnormal, or bizarre. mutant(Adjective) That has undergone mutation.
Best Answer: The Blue Whale, Balaenoptera musculus, is the largest mammal living today. It is also the largest mammal to have ever lived. In fact the Blue whale is the largest animal ever to have lived on the planet as far as we know; bigger by far than ever the largest Dinosaur.
Tallest Animal. The Blue Whale: The Blue Whale with 30 metres in length and 170 tonnes or more in weight is the largest known animal in the earth. This largest animal in the earth can eat 4 to 8 tons (3.6 to 7.3 metric tons) of krill per day.