⠀⠀⠀⠀⠀ ⠀⠀⠀⠀⠀⠀⠀Whales are awesome

Like all mammals, whales breathe air into lungs, are warm-blooded, feed their young milk from mammary glands, and have hair, although very little.

The whale body is fusiform. The forelimbs, also called flippers, are paddle-shaped. The end of the tail holds the fluke, or tail fins, which provide propulsion by vertical movement, unlike the horizontal movement of the tails of fish. Although whales generally do not possess hind limbs, some whales (such as sperm whales and baleen whales) have rudimentary hind limbs; even with feet and digits, hidden deep within their bodies. Most species of whale bear a fin on their backs known as a dorsal fin.

Beneath the skin lies a layer of fat called blubber. It serves as an energy reservoir and also as insulation. Whales have a four-chambered heart. Whales have spines, although the neck vertebrae are typically fused, which provides stability during swimming at the expense of flexibility. They have a vestigial pelvis bone.

Whales breathe through their blowholes, located on the top of the head so the animal can remain submerged while breathing. Baleen whales have two; toothed whales have one. Breathing involves expelling excess water from the blowhole, forming a vertical spout. Spout shapes differ between species and learning to recognize these shapes help people identify them.

The Blue Whale is the largest known mammal that has ever lived, and the largest living animal, at up to 35 m (105 ft) long and 150 tons.

Whales generally live for 40–90 years,[citation needed] depending on their species, and on rare occasions live over a century. Recently a fragment of a lance which had been used by commercial whalers in the 19th century was found in a bowhead whale off Alaska, showing the whale to be between 115 and 130 years old.[7] Furthermore, a technique for dating age from aspartic acid racemization in the whale eye, combined with a harpoon fragment, indicated an age of 211 years for one male, making bowhead whales the longest lived extant mammal species.[8][9] Whale flukes often can be used as identifying markings, as is the case for humpback whales. This is the method by which the famous Humphrey the whale was identified in three separate sightings.

Toothed whales such as the sperm whale, possess teeth with cementum cells overlying dentine cells. Unlike human teeth which are comprised mostly of enamel on the tooth portion outside of the gum, whale teeth have cementum outside the gum. Only in large-GODDAMN WHALES ARE AWESOME!