Owls are nocturnal animals, they are active at night.

A skunk is a nocturnal animal.

We traveled to Kyoto by night bus.

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

We headed to Kyoto by night bus.

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.