Albinos or more sensitive to heat and cold, vibration touch etc. A distinct advantage in total darkness. A blind animal also could very well have an enhanced sense of hearing or smell, taste etc. Another advanatge.
Uhh…do you have any evidence at all to back this up?
This.
People who live in sunnier climes are darker skinned, and the opposite is also true. Pigmentation guards against the sun’s harmful UV rays.