The first difference between sharks and dolphins is the type of animal they are — sharks are fish while dolphins are mammals (like us). Dolphins, and other mammals, are warm blooded, give birth to live young, nurse their young, are born with hair, and breathe air. Sharks, like other fish, have gills to remove oxygen from the environment, are cold blooded, and have scales. Another fact about sharks is that they are what are known as cartilaginous fish, meaning their skeletons are made of cartilage (like our ears and noses) rather than dense bone. Sharks are part of the elasmobranch family, which includes sharks, rays, skates, and sawfish, while dolphins are part of the cetacean family, which includes toothed and baleen whales, as well as porpoises.
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The first difference between sharks and dolphins is the type of animal they are — sharks are fish while dolphins are mammals (like us). Dolphins, and other mammals, are warm blooded, give birth to live young, nurse their young, are born with hair, and breathe air. Sharks, like other fish, have gills to remove oxygen from the environment, are cold blooded, and have scales. Another fact about sharks is that they are what are known as cartilaginous fish, meaning their skeletons are made of cartilage (like our ears and noses) rather than dense bone. Sharks are part of the elasmobranch family, which includes sharks, rays, skates, and sawfish, while dolphins are part of the cetacean family, which includes toothed and baleen whales, as well as porpoises.