biggest dinosaurs ever
Paleontologist: This is the best example we have of any of the most giant creatures. 1  He was a big boy. A very, very big boy. 2  In fact, the Dreadnoughtus schrani dinosaur unveiled Thursday was one of the biggest -- if not THE biggest -- land animal ever to grace the Earth. Experts estimate that back in its day -- the Upper Cretaceous period, approximately 77 million years ago -- this giant measured 85 feet long and weighed about 65 tons.