https://phys.org/news/2018-05-weasels-exposed-predators-scientists.html

The population of white-coated Mustela nivalis nivalis in Poland's Bialowieza Forest, they found, has declined sharply as climate change reduced the number of snow-covered days by half in 50 years.

Compared to the 1960s, snows in the forest's high-altitude regions disappear each year nearly a month earlier, and well before the nimble mammal's fur molts into earth-coloured tones.