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.
Blue whale is not only the largest mammal on earth â¦, but the largest animal of any kind on the earth. Better still, the blue whale, is the largest animal to ever exist on the earth. There are no land mammals that would make the list of the ten largest mammals on earth. But the largest land mammal is the African elephant. But even the mighty elephant is relatively tiny in comparison to the larger species of whales.