1, elephant. Elephants are mammals, long noses and elephants. Elephants are very clever. They can open up a field and bury their dead companions in the fallen leaves. Elephants have a long life span, and generally live to be around 70 years old. 10 ~ 15 years old sexually mature, pregnant for 22 months. Their main external features are flexible and muscular long noses and fan-shaped ears, which have the function of winding and are powerful tools for self-defense and foraging.

2. anteater. Anteaters (Latin name: Anteateridae), mammals, only 3 genera and 4 species, distributed in America. The kiss is long and the mouth is tubular; The tongue is flexible and rich in mucus, which is suitable for licking insects; Ears are small and round; The forelimb is strong, the third finger is particularly developed, and it is a sickle-shaped hook claw, and the hind limb has claws on the 4 ~ 5 toes; The skull is slender and fragile, with no teeth. I like eating ants, termites and other insects.

3. echidna. Echinosaurus (scientific name: Tachyglossidae): the general term for the echidna. It is one of the most primitive mammals. There are 2 genera and 4 species. The back and side of the body are covered with hard thorns, and there are hairs under the thorns; There are hairs on the ventral surface and no thorns, and there is a little hair area in the center, forming a female nursing bag; There is a cloacal hole near the root of the tail. The echidna has a slender snout, and its nostrils and mouth are located in the snout. Small mouth, toothless, slender tongue; Small eyes; There is an outer ear shell, partly hidden in hair; Short limbs, five toes; Toxic distance of male hind limb ankle joint; The tail is short and the bottom is bare.