Nocturnal animal

Diurnality means that most of your activity period occurs while the sun is up.

Nocturnality means most of your activity occurs when the sun is down.

And then there is cathemeral.

Cathemerality is a chunk of activity during the day and the night the classic example in the primate order is from the lemurs and it's the ewe lemur its ratio of activity is approaching 0.5 so it's relatively balanced in terms of its activity in the day and the night so what i was curious about in this most recent paper was taking this ratio of activity which i could do because i had all this actigraphy data Even at one of the projects at the Duke Lemur Center was generating this in about seven different lemur species.

You're on the Brain Bus.

I'm Nova, your driver, and tonight Cosmo and I are taking you somewhere extraordinary.

I'm Cosmo, robot co-pilot and keeper of very important snack-related observations.

Right now, while most of the world is fast asleep, a whole other world is switching on.

Owls, bats, foxes, glowing scorpions.

And when night falls, they emerge into a realm entirely their own.

Nocturnality is not a preference.

It is not a choice.

It is an adaptation, a solution that took millions of years to develop.