1, different in nature: dolphins are aquatic mammals, closely related to whales and porpoises; Whales are divided into baleen whales and toothed whales.
2. Different characteristics: the dolphin is about 1.5- 10 m long and weighs 50-7000 kg; Whales belong to Chordata phylum, Vertebrate Subphylum. All kinds of whales live in the sea, only a few live in fresh water.
3. Different food types: Dolphins mainly feed on fish and squid, and some species can also prey on mammals, birds and large fish; Whales generally feed on mollusks, fish and zooplankton, and some species can also prey on seals and seals.