River dolphins have two flippers and a tail fin. Rope wraps around their upper jaws, flippers and tails. Whales have two flippers on the front, and a tail fin. Claws are absent from both pairs of flippers. Using her hind flippers, she digs a circular hole deep. Rope wraps around their upper jaw, flippers and tail. Sea turtles are almost entirely aquatic and have flippers instead of feet. Pinnipeds have two pairs of flippers on the front and back, the fore-flippers and hind-flippers. Pilot whales' long, sickle-shaped flippers and tail stocks are flattened from side to side. They have streamlined bodies and two limbs that are modified into flippers. They have streamlined bodies and four limbs that are modified into flippers. Baleen whales have two flippers on the front, near the head. A large pair of front flippers powers the turtles through the water. Their front flippers had more than five fingers. Plesiosaurs retained their ancestral two pairs of limbs, which had evolved into large flippers.