Pigmentation deserves to be the topic of a great series of posts. Albinism is the relative lack of a specific common pigmentation, melanin. Leucism is the relative lack of all pigmentation. This bison appears not to be an albino, but a leuc— a leuco? Leucic? Leucist? Well, this post has been derailed. Leucid? Euclid? Lucario?
You can read more about white bison on the Wikipedia article titled “White Buffalo“.
Photo credit found by clicking on photos. Thanks Matt!
Apologies to anyone who googled “euclid lucario.” This is not what you wanted. I doubt what you want exists anywhere.