Owls are nocturnal animals, they are active at night.

A slow loris is a nocturnal animal.

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.

Education about sex is very important.

I saw many animals at the zoo.

I headed to Kyoto on the night train.

His nature is very kind.

Detailed information is needed to understand the nature of that project.