He is studying about ancient animal worship.

As the name suggests, onychophorans are a unique group of animals that have claws.

He has a deep interest in paleozoology.

He is an expert in paleozoology and has a deep knowledge about the ecology of dinosaurs.

It's difficult to memorize the Hyakunin Isshu.

I like memorizing the Hyakunin Isshu.

Anthropozoonosis, or animal-derived infectious diseases, have the potential to spread between humans and animals.

Ogura Hyakunin Isshu is one of the classical literatures of Japan.