A burrow's a hole or tunnel dug into the ground by an animal to create a space suitable for habitation, temporary refuge, or as a byproduct of locomotion. Burrows provide a form of shelter against predation and exposure to the elements, so the burrowing way of life's quite popular among the animals. Burrows are also commonly preserved in the fossil record as a type of trace fossil. Examples Examples of burrowing animals include a number of frogs, amphibians, reptiles (including small dinosaurs)… (More on Burrow)