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Blue whale

The blue whale (Balaenoptera musculus) is a marine mammal belonging to the baleen whales (Mysticeti).

At up to 29.9 metres (98 ft) in length and with a maximum recorded weight of 173 tonnes (191 short tons) and probably reaching over 181 tonnes (200 short tons), it is the largest animal known to have ever existed.

Killer whale

The killer whale or orca (Orcinus orca) is a toothed whale belonging to the oceanic dolphin family, of which it is the largest member.

Killer whales have a diverse diet, although individual populations often specialize in particular types of prey.

Sperm whale

Sperm whales' heads are filled with a mysterious substance called spermaceti.

Scientists have yet to understand its function, but believe it may help the animal regulate its buoyancy.

Common dolphin

The common dolphin is not the dolphin of popular imagination despite its name; that distinction belongs to the bottlenose dolphin (genus Tursiops) due to its widespread use in marine parks and its appearance in the television series Flipper.

See snake

Sea snakes, or "coral reef snakes", are venomous elapid snakes.

They live in marine environments for most or all of their lives.

At present, 17 genera are described as sea snakes, with 62 species.

Green turtle

This sea turtle's dorsoventrally flattened body is covered by a large, teardrop-shaped carapace; it has a pair of large, paddle-like flippers.

It is usually lightly colored, although in the eastern Pacific populations parts of the carapace can be almost black.

Hawksbill turtle

The hawksbill's appearance is similar to that of other marine turtles.

In general, it has a flattened body shape, a protective carapace, and flipper-like limbs, adapted for swimming in the open ocean.

Whale shark

The whale shark is found in open waters of the tropical oceans and is rarely found in water below 22 °C (72 °F).

Modeling suggests a lifespan of about 70 years, but measurements have proven difficult.

White shark

The great white shark (Carcharodon carcharias), also known as the great white, white pointer, white shark, or white death, is a species of large mackerel shark which can be found in the coastal surface waters of all the major oceans.

Parrot fish

Parrotfishes are a group of about 95 species traditionally regarded as a family (Scaridae), but now often considered a subfamily (Scarinae) of the wrasses.