<h1>1, tardigrades</h1>
Tardigrades under the microscope
The creature that looks a little scary in the picture is the tardigrade, in fact, the tardigrade in the picture is enlarged by the microscopic device, in fact, its smallest size is only 50 microns, and the largest is only 1.4 mm.
The tardigrade was first mentioned by a priest named Gotze in 1773, and it still lives on Earth and can be said to be an "ancient creature".
Of course, it is not only this that is amazing, but also its extremely tenacious vitality. In extremely dry or harsh environments, tardigrades shrink into a cylinder shape and wait for habitability (called "cryptogenesis"), in which tardigrades can survive in frozen, air-dried, hot, and even vacuum and radiation environments.
<h1>2, tadpole shrimp</h1>
The picture is the tadpole shrimp, is it cute?
Tadpole shrimp, also known as the three-eyed dinosaur shrimp, its scientific name is Jiapeng crab, first appeared in the Paleozoic Carboniferous Period 300 million years ago, after three Earth century mass extinctions, there are still several strains alive, and widely distributed around the world.
Nowadays, tadpole shrimp not only survive, but many people keep tadpole shrimp as pets, which is also a novel pet.
<h1>3, dinosaur eels</h1>
The color is miserable white and looks a little scary dinosaur eel
Dinosaur eels are scientifically named Senegalese polyfinfish, and in fact, although the name bears the word "eel", it does not actually belong to eels, but is a member of the polyfin fish family.
Dinosaur eels lived in the Cretaceous era because they are thought to be related to dinosaurs. Now they have also put down the body of "prehistoric creatures" and are sold as ornamental fish by many merchants.
<h1>4. Sawfish</h1>
The snout is like a sawfish of a chainsaw
Sawfish also first appeared in the Cretaceous period, and is still widely distributed in the world's tropical and subtropical shallow waters, benthic, elongated, flanked with strong teeth, is a ferocious creature.
<h1>5. Arowana</h1>
Over-the-back Arowana
The earliest appearance of this arowana dates back to the Jurassic era. They are still active today, and have been found in the Amazon Basin, parts of Africa, Asia and Australia.
Although most of the time they are raised as ornamental fish, they are actually very fierce, like to prey on small animals, and can jump to a height of about 2 meters to prey on birds and bats.
In China, Arowana is known as "Arowana" because of its appearance and body color, and is regarded as a harbinger of luck, so many commercial places such as restaurants will raise some Arowana, which can be seen every day.