It is time for a land iguana check up. and this guy obviously does not know what's good for him. once a year the park rangers of galapagos make sure these scaly locals are all eating and growing and meeting, and most importantly, they make sure that the invasive rats aren't winning. so the little guy scoots in here. he smell this is bait. and he touches that, snap. he's stuck. now is this poison in here? >> no. >> the poison is laid out in pellet form, which means there is always some collateral damage. playing god ain't easy. for example killing rats helps save the iguanas, but it also starve...