Twilight princess acquiring tears with bird problem

I think I figured out what part of the game you are referring to. The 4th parasite is not in the cave. (If this is the part I'm thinking of) ... Use Midna to help you climb up the scaffolding and out of the cave. You'll wind up in a graveyard. once you're in the graveyard you'll find the next parasite. right in the middle of the graveyard buried... just use your sense view near the middle and you'll find it... and if i'm correct there are 15 or 16 parasites you have to find.... let me know if you need any help finding the rest!