The largest animal on Earth today is the Antarctic blue whale, an animal that weighs about 180 tons when fully grown. But scientists have now discovered a fossil in Peru that suggests there was once an animal that weighed even more than that.
The animal, known as the Perucetus colossus, was a prehistoric whale believed to have weighed about 200 tons, with a maximum weight of about 320 tons. The enormous whale is not as long as a blue whale, but is much denser due to having bones with filled inner cavities to support its immense weight.
It is thought that the animal last lived about 39 million years ago and had a skeleton with 13 vertebrae, four ribs and part of a hip bone.
Scientists are still studying and researching this long-extinct creature.