The humpback whale and many further animals feed by straining seawater through long strips of baleen that they have in the place of teeth. For centuries, whales have been hunted for meat and as a basis of raw materials. By the middle of the 20th century, however, industrial whaling had left numerous species of these animals seriously endangered. This caused the end in all but a few countries. Numerous organizations have been founded to try to abolish hunting of whales and other threats to whale survivals.
Like all mammals, whales breathe air into lungs. These types of animals are warm blooded, feed their little milk from mammary glands, and have hair, although very little.
Their body is fusiform. The forelimbs of these animals also called flippers are paddle shaped. The end of the tail holds the fluke or tail fins which provide force by vertical movement. Although whales generally do not have hind limbs, some whales have elementary hind limbs. Most species of whale have a fin on their backs known as a dorsal fin. Beneath the skin of these animals lies a layer of fat called blubber. It serves as a power reservoir and also as insulation. Whales have a four chambered heart. Whales have spines, although the neck vertebrae are naturally fused, it provides steadiness during swimming at the expense of flexibility.
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For aquatic mammals of the order Cetacea, whale is the common name. The term whale is sometimes used to refer to all cetaceans. In extra common English usage it generally excludes the members of the Delphinoidea superfamily, such as dolphins and porpoises. These minor species of these types of animals belong to the suborder Odontoceti which also includes the sperm, killer, pilot, and beluga whale. The other suborder of cetaceans includes the blue whale. This is the biggest animal known to exist.
For aquatic mammals of the order Cetacea, whale is the common name. The term whale is sometimes used to refer to all cetaceans. In extra common English usage it generally excludes the members of the Delphinoidea superfamily, such as dolphins and porpoises. These minor species of these types of animals belong to the suborder Odontoceti which also includes the sperm, killer, pilot, and beluga whale. The other suborder of cetaceans includes the blue whale. This is the biggest animal known to exist.
