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

He is a world-renowned zoologist.

A lion is a type of carnivore.

Ruminants have the characteristic of re-chewing food after swallowing it once.

My pet is a dog.

His tribe has been practicing zoolatry since ancient times.

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.