The primarily nocturnal anaconda species tend to spend most of its life in or around water.

They are primarily nocturnal and spend the day sleeping in dense vegetation.

While primarily nocturnal, they can occasionally be seen during the day.

Coyotes are primarily nocturnal, but can often be seen during daylight hours.

Hedgehogs are primarily nocturnal, although, depending on the species, they may be more or less active during the day.

It is primarily nocturnal, spending only evenings and nighttime above ground in the summer.

The solitary living fishing cats are thought to be primarily nocturnal.

Primarily nocturnal, this fish is generally shy under the light and will keep in hiding during the day.

Margays are primarily nocturnal, although in some areas, they have also been observed to hunt during the day.

It is primarily nocturnal and spends most of the day in its den.