Reptilicus (1961) torrent

A portion of the tail of a prehistoric reptile is discovered in Denmark. It regenerates into the entire reptile, which proceeds to destroy buildings and property and generally make a nuisance of itself. It can fly, swim, and walk, and has impenetrable scales, which makes it difficult to kill.

What can one say about Reptilicus? Keep him tied up in the back yard and well fed. Things should be fine them... ;)