The animal kingdom is incredibly diverse, and it is said that there are still species that have not been discovered.

The animal kingdom is known for its diversity and complexity.

I avoid eating animal products.

He is deeply involved in the animal liberation movement.

Protozoans are single-celled organisms.

As the name suggests, chordates are a group of animals that have a notochord.

He is majoring in zoology at university.

He is a world-renowned zoologist.

Mammals can maintain a constant body temperature.

Roundworms are an important part of the soil and contribute greatly to the health and fertility of the soil.