I have a sterlet in my aquarium.

He is an expert in tidology, conducting research on ocean tides.

He is majoring in tidal science.

E. coli is one of the bacteria that normally reside in the human intestine.

His personal strength is that he is very sincere.

Her family adopts a matriarchy.

The tundra swan lives in cold regions.

I saw a whooper swan in the park.

The mountain avens is one of the beautiful flowers in the mountains.

He is the editor in chief of this magazine.