Biggest Extinct Animals In The World. It might come as a surprise that the largest animal ever recorded still lives today, although it is on the endangered species list. They arrived on the scene 235 million years ago and virtually ruled over the planet for 135 million years until they were wiped out 65 million years ago.
Basilosaurus was once recognized as one of the largest known extinct cetaceans at 18 metres (59 ft) in length. It’s believed to have been killed by off by global warming like many other extinct animals. We all know that some of the biggest animals that have ever roamed the planet were dinosaurs.
Megafauna are simply big animals.
Megafauna are simply big animals. When people think about the largest animals that ever lived, dinosaurs are often the first thing to come to mind. The myriapods (“many feet”) which comprise millipedes and centipedes. These birds frightened the prehistoric world.