Publisher's note: we LOVE the amazing articles from our US Fish and Wildlife Service about our natural world. Here's one about tracks in the snow!

Who goes there? Winter is a great time to find out. The snow tells secrets about the natural world.

In woods and plains and less trafficked city streets, the movements of many shy creatures can be revealed in a fresh cover of snow.

Snow can reveal the mysterious lives of critters in the night.

These tracks were made by elk. The tracks indicate that elk were zig-zagging through the snow, digging for vegetation buried beneath.