The term 'Sometimes-White Animal' is referring to a STOAT, which is a small mammal that is native to Eurasia and North America. It is a member of the weasel family and is known for its long, slender body and short legs. The STOAT has a coat that changes color depending on the season, ranging from white in the winter to brown in the summer. It is an agile hunter and feeds on small rodents, birds, and insects.