Long-distance travel mode of animals

Many animals can tell the direction, go far away and find their way home.

Bees can fly away from the hive for several kilometers when collecting honey. Someone took some bees from the hive, marked them, put them in the box, took them far away, and then let them out. Some bees make a circle or two in the air and then fly back to their hives.

There are many fish that can swim much farther than bees, and there are certain seasons. Some fish swim against the current in early summer, from deep sea to shallow sea or river to lay eggs, and then return to deep sea in autumn. China's bass is like this. On the contrary, there is an eel in Europe. They grew up in the river until they were ten years old, then swam to the deep sea to lay eggs, and finally died and were buried at the bottom of the sea. After the young eel hatches, it will take three years to swim to the inland river in Europe, and then migrate to the ocean at the age of ten.

The ability of birds to travel far is even more amazing. Humans have used pigeons to spread books for more than two thousand years. The pigeon that flew farthest once flew over Eurasia from France and returned to Vietnam. Pigeons were kept in a cabin and taken to a strange France. The flight distance is completely strange. Pigeons are raised by people and are generally trained. Swallows are untrained and have great ability to go home. Someone caught seven swallows in Germany, let them fly near London, England, and then set them free. The distance between the two places is 1000 km, and five swallows fly back to their hometown.

Animals often have to overcome many obstacles in their migration. Their patience and perseverance are admirable. It seems that salmon (commonly known as salmon) was born in the river and swam downstream to live in the ocean more than 2000 kilometers apart. After foraging in the ocean for three to seven years, they return to their hometown in droves to lay eggs. When they go upstream in the river, they jump desperately, often scarred halfway, and even the scales fall off, but they continue to move forward resolutely until they reach their destination.

In addition to amazing patience and perseverance, the ability of animals to find their way is amazing. It seems that the nightingale's young birds were not taught by the old birds before they migrated. Old birds fly south, but young birds can't fly yet, but when they grow up, they will look for them? The direction of travel. These strange things

Strange phenomenon, biologists are still studying, and have not found the answer yet.