Tonight Marks the Start of ‘Monster Week’ on Animal Planet

River Monsters has made a splash with Animal Planet viewers (the best-performing series in network history), so it’s only natural that it would inspire something a bit bigger, a bit creepier. So, beginning tonight at 8pm ET/PT, Animal Planet will bring you Monster Week — a full week of River Monsters, new episodes of Call of the Wildman and Finding Bigfoot, and a the two-hour CGI special, Mermaids: The Body…