Why do animals make up the majority in totem worship?

Why do animals make up the majority in totem worship? This is due to the narrow vision of the early people and the characteristics of the clan system. Primitives did not understand the principles of sex and reproduction of human beings, but believed that the ancestors of the clan were closely related to certain animals and plants, especially animals; the ancestors of the clan were the metaplasia or reincarnation of totem animals and plants. In the primitive primitive society, besides animals and plants, where can people find materials to explain the origin of mankind? Animals and humans are similar to humans in many places, and they have many advantages that humans do not have. For example, birds can fly in the air, fish can swim in the water, reptiles can shed their skins, and shelter underground... All this is what the first people thought The reason why animals are placed first in totem objects.