Three-eyed dinosaur shrimp, scientific name: horseshoe crab, also known as horseshoe tube, turtle cover, rollover, dung beetle cub, money lock and so on. Is the only known horseshoe crab in China. It first appeared in the Paleozoic Carboniferous 300 million years ago. After three extinctions in the earth's century, several strains still exist and are widely distributed around the world.

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Three-eyed dinosaurs and shrimps are mostly found in natural ponds, but the ponds will dry up and disappear during drought, and adults will dry up and die due to lack of water, but their larvae and eggs have entered a special biological phenomenon-diapause because of drying up. Until the next rainy season comes, the original low-lying land will form a natural pond again, and their eggs will be nourished by the rain and will hatch immediately.

According to the current laboratory research of scientists, as long as it is kept dry for at least 25 years, that is to say, the egg of a three-eyed dinosaur shrimp will still hatch if it meets the right environment for 25 years. It is precisely because of the diapause period that the three-eyed dinosaur shrimp escaped the extinction of dinosaurs.

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