Mammals can maintain a constant body temperature.

Owls are nocturnal animals, they are active at night.

The Japanese dormouse is a small mammal endemic to Japan and is nocturnal.

I go hiking in the mountains every weekend.

He is driving a small-sized car.

That flower has a characteristic scent.

The particular scent of that flower filled the room.

We headed to Kyoto by night bus.

We traveled to Kyoto by night bus.

He was trembling in fear of the night parade of demons.