Question

Is being nocturnal a behavioral adaptation?

Answer 1

Nocturnality is an animal behavior characterized by being active during the night and sleeping during the day.
The common adjective is "nocturnal", versus diurnal meaning the opposite.
Nocturnal creatures generally have highly developed senses of hearing, smell, and specially adapted eyesight.

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Answer 2

Yes, being nocturnal is a behavioral adaptation because they show a change in their instinctive reactions when it improves their ability to find food, avoid predators or to produce offsprings.