All you need is a little imagination and patience. Proper film exposure in the snow can be rather tricky. I only use slide films, and they have a shallow exposure latitude. In order to have snow appear white on film, it is necessary to overexpose it by up to two stops, and that doesn't always produce the pleasing results. Bright sunlight on snow is usually not very inspiring on film.
Winter time can be a very difficult time of survival for many animals.
One should always consider the impact on an animal before approaching it for photography. Where I live, winter snows often accumulate to a depth of more than 8 feet. I've found that they are often very nervous when the snow is deep, and any disturbance will cause them to abandon feeding. When life hinges precariously on an animal's ability to find scarce food, I don't believe it is morally right to disturb it from doing so no matter how nice the photo will look. Still, it is possible to do wildlife photography in the winter, and often it may be the best time to shoot some subjects.