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.
African elephants are currently the largest animals on land. They have a similar life-span to humans and can live to be 70 years old. The largest living bird is the ostrich. They live in Africa and have the largest eyes of any land animal-each eye is 5cm wide. A group of animals called arthropods includes insects, spiders and crabs. The largest ever was a sea scorpion called Jaekelopterus which could grow to 2.5m long, but it went extinct millions of years ago.