First of all, killer whales

Black whale is a large toothed whale, with a body length of 8- 10 m and a weight of about 9 tons. Its head is slightly round and its beak is not obvious. The dorsal fin is tall and upright, and the bending can reach 1 m; The body is black and white. The wings are far apart. The temporal fossa is very large. The mandible is relatively short. There are 10- 12 conical teeth in the upper and lower jaws. Long and thin mouth, sharp teeth, fierce temperament, carnivore, good at attacking prey, is the natural enemy of penguins, dolphins, seals and other animals. Sometimes they attack other whales, even great white sharks, which is called the overlord of the sea.

Sometimes killer whales hunt in packs. They communicate with each other and plan their tactics by using ultrasonic waves from their long foreheads (the part of dolphin family used for echolocation and gathering sounds into a beam). They will also gather the fish together into a big ball, and then take turns to drill into it for food.

Second, sperm whales.

Sperm whale: The head is very big, the jaw is very small, and only the jaw has teeth. Mainly eat squid. With a body length of18m and a weight of more than 50 tons, it is the largest toothed whale, with its head accounting for 1/3 of its body and no dorsal fin. With strong diving ability, it is the mammal with the deepest diving and the longest diving time. Breathe with your lungs like a fish. The neck is short, and the head seems to be connected with the trunk; Cervical vertebra healing; The nose is a jet hole, located at the snout, with fins on the forelimbs, the forearm degenerates, the palm becomes longer and the number of toes increases, but the toes and claws are not visible from the outside; Hindlimb degeneration; Shaped like a fish, it has a horizontal tail fin and swims and swings by its tail.

Third, the blue-ringed octopus

The blue octopus is a very small octopus with an arm length of no more than15cm. It can feed small fish, crabs, shrimps and crustaceans, and paralyze its prey with a very strong toxin (tetrodotoxin). In the ocean, the blue-ringed octopus is one of the highly toxic creatures, and being bitten by this small octopus will cause death. But this octopus will not take the initiative to attack humans unless it is greatly threatened.

The toxicity of blue octopus can be seen from its own color. Its skin contains color cells that can change color at will. By shrinking or stretching, changing the size of cells with different colors, the overall appearance of the blue-ringed octopus will change. Therefore, when the blue-ringed octopus moves in different environments, it can use the same protective color as the environmental color. If threatened, their blue rings will flash, hence the name blue-ring octopus. The cells on these blue rings are densely covered with bright colored crystals formed by reflected light. The blue octopus uses these unique rings to warn other creatures that it has deadly weapons.

Fourth, stone fish

Stone fish is a kind of fish with strong toxicity in nature, and its "fatal sting" is described as the most painful sting for human beings. Stone fish looks unremarkable, with a length of only about 30cm. They like to hide under the sea or rocks and disguise themselves as inconspicuous stones. If someone does not pay attention to stepping on it, it will immediately fight back rudely and send out deadly venom. On its back, there are 12 to 14 needles as sharp as needles, which can easily penetrate the soles of shoes and puncture the soles of feet, causing people to be poisoned quickly and suffer severe pain until death.

Great white shark

The horrible image in the movie Jaws makes everyone think that the scariest creature at that time was Jaws. The biting force of great white sharks is as high as per inch 1 ton. The consequences of such a big bite can be imagined. However, the great white shark attacks humans only about 10 times a year. It doesn't take the initiative to attack humans, sometimes it just opens its mouth to keep people away from it.

Six, fangs fish

Toothfish inhabit particularly deep places in the ocean. Although their most common habitat is 500-2000 meters, the middle part of the deep sea area as deep as 5000 meters is their horrible home. The water pressure here is terrible and the temperature is close to freezing point. Food is scarce here, so these fish eat everything they see. Most of their food may come from the upper ocean.

Although this kind of fish is not afraid of cold, it is distributed in the depths of tropical and temperate oceans, and more food falls from it. Adult fish with fangs look very different from young fish. The skull of young fish is long and light gray, with a big head and a big mouth, and the color ranges from dark brown to black. Young fish don't start to look like adult fish until they grow to 8 cm. Young fish eat crustaceans, and adult fish eat fish.

Seven. Red king crab

The scientific name of red crab is Kamchatka stone crab, which can weigh 10 kg. Its huge pliers can snap people's fingers at once. The red king crab, which is 1.5 meters long and weighs 10 kg, can bring great disasters to other creatures in the marine world. The rapid development of the Red King Crab prompted some Norwegian marine experts to call on the government to give subsidies in order to launch a "blitzkrieg" against the Red King Crab and prevent it from going south quickly. For many years, the Norwegian government has turned a blind eye to the red king crabs in the underwater world, not sure whether they should be regarded as resources or pests. But the good news is that the red king crab tastes good. The famous British Mark &; Spencer is providing people with this red king crab food.

King crabs are much bigger than ordinary crabs. They "rampaged" along the west coast of Norway, eating all edible marine life, such as shellfish and fish eggs. Environmentalists worry that the red king crab may eventually bring a devastating blow to the local and Spanish and Portuguese marine environment.

Eight, coelacanth

Coelacanth coelacanth. Any of several bony fishes with leaflike fins. The closely related but extinct subfamily Fanfin is considered as the ancestor of terrestrial vertebrates. In some classification systems, coelacanth and fanfin are considered to belong to different orders of the phylum Ampoptera. Coelacanth first appeared 377 million years ago, when it was extremely abundant on the earth.

Modern coelacanth is a deep-sea fish of Fistulae, which is named after its hollow fin spines. Bigger than most fossil species. This is a fierce carnivore, heavy and sticky, with limbs-like fins and flexible movements. Bright colors, easy to distinguish.

Nine, big squid

Squid is a terrible marine life. For human beings, there are countless mysteries in the ocean, and there are a lot of "monsters" in the ocean that people don't know much about. Living in the deep seabed of the Pacific Ocean, people don't know much about the mysterious "big squid". A legend among sailors makes this mystery even more legendary: their huge tentacles can extend directly from the bottom of the sea to the sea level, and their powerful suction cups can tear the hull.

Its temperament is extremely fierce, it feeds on fish and invertebrates, and it can fight with giant whales. According to records, once a king squid was witnessed clinging to a sperm whale with its thick horns and sucker, and the sperm whale tried its best to bite the tail of the king squid. Two behemoths in the sea rolled violently, causing the turbid waves to soar, and then both of them sank to the bottom and disappeared.

X. Lion-maned Jellyfish

This jellyfish is bigger than the king squid, and its tentacles can grow to 36 meters, which is longer than the blue whale. Swimming is fast enough, so they can easily hunt prey. Although they have no teeth, they sting their prey with poisonous tentacles first, and then eat after the prey is paralyzed.