Invertebrates are a type of creature without a skeleton.

He is an expert in ethology, and his research is highly regarded worldwide.

He is studying about ancient animal worship.

Cnidarians are a type of marine life, including jellyfish and corals.

We went to the petting zoo on the weekend.

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

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

He has a deep interest in paleozoology.

The ecosystem of zoobenthos is an important field of study in marine biology.

His long talk is just like 'a hundred days of sermonizing without a fart.'