Why is it that some animal furs (ex. hares) turn white in winter while others (ex. deers) turn darker?

I know some animals do it for camuflage, but what about the others?Why is it that some animal furs (ex. hares) turn white in winter while others (ex. deers) turn darker?
It's still for camouflage. The smaller animals need to hide in the snow; the larger animals need to hide among the trees, which are also darker in the winter.Why is it that some animal furs (ex. hares) turn white in winter while others (ex. deers) turn darker?
Darker coloration can also absorb sunlight better, much as a black car heats up more in the summer sun than a white one.
As summer begins, the animal sheds its white coat for a brown one, perfect cover for summer. The change back to a winter coat occurs in September and October. By November the white winter coat is complete.





Foxes of the different coloring remain dark or charcoal colored all year but become a little lighter in winter.
White in winter camouflages against the snow......