This is more of a place holder at the moment. Currently each map has 2 species with rare fur possibilities, albino and melanistic. There are theories out there that each map has limits for at least so many on the map or a maximum number. Personally, I have gone long periods of seeing zero rare furs and then periods where I see them a lot. Personally, I am not sure that it is anything more than a random chance with no limits in either direction. I am always looking to see if I notice anything that may shed more light on the topic, but I do not see any way to settle it for myself.
This link is from SlothsRage from some of his amazing luck and skill finding rare fur animals. Also cool to hear and see his perspective of the hunting.
Going Over my best day of hunting in #wayofthehunter – Slow down and retelling the story! – YouTube