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

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.

He decided to start a new business and reminded himself that even a journey of a thousand miles begins with a single step.

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

He was anxious about starting a new business, but I encouraged him by saying, 'Even a journey of a thousand miles begins with a single step.'