So many ways to build a shelter

Who hasn't dreamed about building a hidden cabin in the woods or a secret place far from prying glances? Just like humans, animals need shelter -- a quiet, safe place to call their own. Some animals are not very ambitious and are content to use the surrounding vegetation to build their cozy little nests, but others are very imaginative and use extremely complex materials. Tunnels, rocks or makeshift houses on piles -- come and visit the unusual dwellings of these master builders.