It can be hard to watch wildlife in winter. Animals are often snugged up in dens, perched in trees or otherwise out of sight.

Animal signs, on the other hand, are easier to find in winter than any other time of year--assuming there is snow. A blanket of snow is an animal detective's best friend. Every time a critter takes a step, they leave an impression of who they are, where they are going and how much of a hurry they are in.

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