How do sharks navigate underwater? How does it know it s swimming in the right direction?

Sharks are a very old fish, they appeared even earlier than the dinosaurs, and the ancestors of sharks can be traced back to the Ordovician.

Period, this period is about 100 million to 100 million years ago, the ancestors of sharks and primitive vertebrates.

At first, the ancestors of sharks belonged to bony fish, but the changes in the earth's environment, sharks also evolved, and sharks gradually transformed from bony fish to cartilaginous fish. The expansion of shark populations began in the Triassic period, and the expansion of shark populations also completely changed the original ecosystem of the ocean.

Wait until the Cretaceous.

of species went extinct, huge sea creatures began to go extinct, and sharks began to dominate the marine ecosystem.

Sharks are very widely distributed and can be seen in any corner of the earth's oceans, mainly from various mammals in the ocean.

Fish and reptiles.

etc. for food. Sharks have a very developed sense of smell, they will smell blood from a distance of several kilometers, and track it very quickly, in addition to their sense of smell, their sense of sight and hearing is also very good. However, they have a special device electroreceptor in their body, which has the ability to sense the earth's magnetic field, which allows them to never get lost in the vast oceans, and they will travel through the world's oceans with great precision.

Because there are a lot of electrolytes present in seawater.

So seawater is a conductor. Sharks have small holes in their nasal cavity that are able to sense weak changes in the magnetic field. Sharks travel between their native and breeding grounds every year, which is why sharks are able to detect the Earth's magnetic field.

In fact, sharks have the ability to be found in many animals in nature, such as pigeons, pigeons can also detect the earth's magnetic field, and they can easily return to their homes hundreds of kilometers away. It is because the pigeon's beak has a unit cell that has the ability to sense the earth's magnetic field, and the main component of this unit cell is very similar to magnetite.

Sharks use the Earth's magnetic field to navigate underwater. The shark feels the change in the magnetic field, so as to sense the direction of the prey and the change of the environment, which side has a strong magnetic field, it swims in which.

Sharks are able to know exactly where they swim because they can navigate according to the position of the sun and moon, can also distinguish different scents by smelling and can determine their direction, and even more incredibly, they can even use the earth's magnetic field to determine their direction.

Yes"Sense of smell"Navigation, theirs"Sense of smell"There are near the nerves"Magnets"and geomagnetic field action. so that they can sniff out"Directions"of"Taste".

Here's how sharks swim in the water:

The shark swims mainly on its body, moving like a snake and swinging like a tail fin like a oar. Most sharks cannot enter or retreat when swimming, sharks do not have swim bladders, and the proportion of such animals is mainly determined by the amount of oil stored in the liver. Sharks are denser than water, and if sharks don't swim aggressively, they will sink to the bottom of the sea.

The shark has 5 or 7 gill slits on each side, and as it swims, seawater is sucked in through a half-open mouth, and flows out of the gill slits for gas exchange.

Shark Introduction:

Sharks belong to the subclass of vertebrate phylum Chondrichthyes plate-gills, and a few species enter freshwater, and are a group of medium-to-large marine fish that swim fast.

The endoskeleton of the shark is composed entirely of cartilage, often calcified, but without any true bone tissue, the exoskeleton is not very developed or degenerate, the body is often covered with skin teeth (qualitative scales), the teeth are diverse, and there is hard muscle, but the membranous bone never exists, and the brain is seamless. The upper forehead is composed of palatal cartilage, and the lower forehead is composed of Mei's cartilage.

The body is long spindle-shaped. gill cleft lateral, pectoral fin normal, not healed with the anterior edge of the snout; dorsal position of northern fin; Crooked tail type.

The body is spindle-shaped, with cleft gills on both sides of the head, but resembles a common fish. With a few exceptions, the typical shark** is hard, dull gray in color, with tooth-like scales that make ** appear rough. The tail is strong and powerful, not symmetrical, upturned; Fins are pointed; The snout is appointed, anteriorly protruding, with a crescent-shaped mouth and triangular fangs under the snout.

Sharks have no swim bladder and need to swim constantly to avoid sinking to the bottom.

The above content reference: Encyclopedia Shark.