Nobody likes being caged up — even in the animal kingdom. Animals kept in captivity are always looking for a way out — if for no other reason than to satisfy an innate curiosity about the outside world. There are few events that demonstrate the ingenuity of our non-human brethren like when they outwit human captors. The television shows "Prison Break" and "The Fugitive" have got nothing on these remarkable animal escape stories: Here are six animal escape artists that would make Harry Houdini proud.
This gallery originally appeared in December 2011 and has been updated.