If you’ve ever seen a dolphin swim, you may have wondered why they undulate their bodies up and down when swimming, instead of side to side as fishes do. Though they have a fishlike body, cetaceans (a group comprised of whales, dolphins, and porpoises) are mammals that descended from land-dwelling ancestors—same as cats, dogs, mice, elephants, cows, and humans. If you’ve ever seen a dolphin swim, you may have wondered why they undulate their bodies up and down when swimming, instead of side to side as fishes do. Though they have a fishlike body, cetaceans (a group comprised of whales, dolphins, and porpoises) are mammals that descended from land-dwelling ancestors—same as cats, dogs, mice, elephants, cows, and humans. Plants & Animals Evolution Phys.org – latest science and technology news stories
Unraveling the evolutionary secrets of how whales and dolphins adapted their backbones for aquatic life
