"Nocturnal" is an inherited template that can be added to any living, corporeal creature that is normally active during the day. A nocturnal creature uses all of the creature’s base statistics, except as noted below.
CR: Unchanged from base Creature.
Weaknesses: A nocturnal creature gains the weakness Light Sensitivity (Ex).
A nocturnal creature gains low-light vision and can see twice as far as a human in starlight, torchlight, moonlight, and other low-light conditions. If the base creature already has low-light vision, it gains darkvision to a range of 60 ft.
Skills: A nocturnal creature benefits from a +4 racial bonus to Perception and Stealth checks. When inside or looking into an area of bright light (daylight spell or greater illumination), the nocturnal creature takes a -4 on Perception checks.