It is no more than 8 cm long and lives on the coast of South Africa and Australia. It is a strange mollusk, belonging to the species of sea slugs. It looks beautiful and looks like an "alien creature".

2, red-lipped bat fish

Produced in Ecuador. Its most distinctive feature is that it has a pair of pull-down red lips, which makes it look glum.

3. glass frogs

This frog is produced in the tropical rain forest area of America. It has transparent skin and its internal organs are clearly visible.

4, Satan leaf-tailed gecko

This is a unique animal in Madagascar. This animal can imitate withered leaves realistically, curl up its body and become another "leaf". It is named because its eyes are dark red. Unfortunately, this animal is on the verge of extinction.

5. Mexican salamander

Also known as the "submarine hexagonal dinosaur", it is an amphibian. This animal is in danger of extinction because it has been killed in large quantities and used in medicine.

6. Drip fish

It is produced in Australia and Tasmania, and its whole body is gelatinous and lacks muscle tissue. The living habits of this animal are quite passive. It never swims or preys hard, and depends on the remains of fish in the deep sea to survive. Because the dripping fish looks depressed, it is also called "the fish with the saddest expression in the world". It also won the title of "the ugliest animal in the world".

7. Ye Hailong

It grows in Australian waters and its living habits are similar to those of seahorses. Its appearance is easy to protect itself, and it looks like a pile of leaves, which is ignored by predators. In addition, the breeding method in Ye Hailong is very special. The female sea dragon lays her eggs in the pouch at the tail of the male sea dragon, and the male sea dragon completes the pregnancy and delivery.