I can not think of the name of the movie?????!

It is a scifi channel movie, atleast that is where I seen it!. It is about a boy and his family who live on this island, and the boy goes hunting and attracts like a large iguana looking thing back to his house and it kills his parents and a couple years later he goes back and kills those reptile things on this island!. If anybody knows this movie please let me know!. I have not seen it in a long time!.!.!.!.Www@Enter-QA@Com

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