What is the biggest animal that has ever lived?

A member of the order Cetacea, the blue whale (Balaenoptera musculus), is thought to be the largest animal ever to have lived. The maximum recorded weight was 190 metric tonnes for a specimen measuring 30 metres (98 ft), whereas longer ones, up to 33.4 metres (110 ft), have been recorded but not weighed. read more

Most people believe that the largest animals to ever exist on Earth were the dinosaurs. However, one of the largest land dinosaurs, the sauropod Argentinosaurus, weighed only about 180,000 pounds (81,647 kg). That's little more than half the size of an adult blue whale. It makes a lot of sense that the world's largest animal would be a sea creature. read more

The largest dinosaurs, and the largest animals to ever live on land, were the plant-eating, long-necked Sauropoda. The tallest and heaviest sauropod known from a complete skeleton is a specimen of an immature Giraffatitan discovered in Tanzania between 1907 and 1912, now mounted in the Museum für Naturkunde of Berlin. read more

The largest animal that has ever existed and still exists is the blue whale (Balaenoptera musculus). Its length can reach 30m and its weight over 181 tons. The longest blue whale ever recorded was 33.6m. read more