text: Dog Extinctions Show Why Bigger Isn #39;t Better Fossils from extinct dogs show why bigger is not better -- giant meat-eating animals died out because they relied too heavily on hunting other big animals, scientists reported on Thursday.
inputs: Dog Extinctions Show Why Bigger Isn #39;t Better Fossils from extinct dogs show why bigger is not better -- giant meat-eating animals died out because they relied too heavily on hunting other big animals, scientists reported on Thursday.