Mammals can maintain a constant body temperature.

Animal experiments are necessary for the advancement of science, but there are also ethical issues.

He is learning about the handling of experimental animals.

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.

My pet is a dog.

I saw a stray cat in the park.

My pet is a Siamese cat, and it's very smart.

The smile of the Cheshire cat is very mysterious.

In the sumo match, the wrestler used a 'neko-damashi' (distracting clap) to confuse his opponent.