He is majoring in zoology at university.

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.

He is a world-renowned zoologist.

Rabbits are herbivores and mainly eat grass.

A lion is a type of carnivore.

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

My pet is a dog.

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.