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

I couldn't understand his actions.

He started to act immediately.

He is looking for a certain book.

Please specify your request.

He is majoring in zoology at university.

I saw many animals at the zoo.

The term 'stereotypy' is a part of ethology, referring to the phenomenon where a specific animal repeats a specific behavior.

Learning about the culture of specific Asia is very interesting.

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