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nocÂ·turÂ·nal. adj. 1. Of, relating to, or occurring in the night: nocturnal stillness. 2. Botany Opening at night.
The nocturnal mammalâs eye has adapted to the dark. What diurnal mammals see as pitch-black darkness, nocturnal mammals see as dim light or shades of gray. Nocturnal mammals have proportionally larger eyes than mammals who are awake during the day; a tarsierâs eye is so large it canât even move in its socket. Their pupils are also able to open more widely in low light than the diurnal mammalâs pupils.