Tiger, wolf, mouse, deer, marten, monkey, tapir, sloth.

Zebra, dog, fox and bear are like leopards, musk oxen and lions.

Red panda warthog antelope reindeer koala rhinoceros lynx pangolin

2. Fish

Arowana, pond fish, catfish, shark, octopus, stickleback, herring, salamander.

Loach, trout, koi fish bream, angelfish, eel, tropical fish, flatfishes.

Tiger, tiger, crocodile, perch, ray, carp, herring, tuna, deep-sea fish

3. Birds

Eagle, heron, goose, penguin, hornbill, gull and stork

Grouse, boobies, parrots, mandarin ducks, woodpeckers, owls and ostriches.

Kingfisher swan hummingbird albatross crane pheasant seagull

4. Amphibian sea lion turtle lizard turtle toad giant salamander

5. Insects

Butterfly dragonfly scorpion trematode coral ciliate? Tapeworm? salamander

Earthworms, fleshpods, barnacles, Daphnia, leeches, crickets, centipedes and locusts.

Extended data:

1, the physical characteristics of mammals are:

First, their skin is generally thicker than other vertebrates, and it consists of epidermis and dermis.

Second, mammals have regenerative teeth in their mouths.

Third, all mammals are viviparous except the monotremes.

Fourth, mammals have a highly developed nervous system, the brain is much more developed than other vertebrates, and there are 12 pairs of cranial nerves. In addition, the breast-feeding heart is divided into two ears and two ventricles; There are red blood cells, but no nucleus.

2. The characteristics of social behavior are as follows: certain organizations are often formed in groups; There is a clear division of labor among members; There is also a strict hierarchy. For example, in the group life of baboons, the "leader" is the male baboon who enjoys priority and other members express obedience to him.

References:

Baidu encyclopedia-mammals