It's easy to forget about all the eons, epochs, and eras of the earth's vibrant, eventful, and fully alive history before the first humans. During the millions of years before the advent of humankind, all sorts of massive animals, many of them distant ancestors of the animals we know today, roamed the lands and haunted the seas. During a time of no human predators, these megafauna had the evolutionary freedom and the natural abundance to grow gargantuan in size. The earth truly was once the land of the giants.
Intrigued? Read on to find more about the huge animals that once roamed our planet.