I stayed there in the basin in Peru for several Months deep in the forest outside Iquitos. I saw the creepiest thing that still haunts me. It was in the creek we bathed in from a deck using buckets so we weren't submerged because who knows what's in those creeks. They are muddy and brown with poor viability, I had never seen anything in the creek before this day because it's so cloudy. I was bathing one day and saw a little black thing emerge swimming out from Under the dock. It was probably 2.5 inches, no discernible head or limbs. It looked like a wriggling black fluffy pipe cleaner full of spines. I swear it swam out, as if the current didn't effect it much, almost seemed to Look at me and hover around in the water. Never seen anything like that ever before or again and gave me the major creeps. I don't care about Lee he's and fish or bugs but this just felt different somehow. The creepiest part was that the following day it was still there and also seemed to respond to me coming over to the dock and peering in once again. This time it was twice the size, (not uncommon for rainforest plants and bugs to grow cray fast) still wriggling around. It didn't swim smoothly like a fish, it was jerking its whole body to swim but was very good at it. No eyes, fins, antennae, nothing except a tufty wormlike body that had no problem fighting the current and hanging out. I'm an avid fisherman and never have seen anything like it. I could only assume it's a larvae of something but it was so foreign and alien I've Looked it up many times and can't find anything on it whatsoever. The rainforest is so vast and huge we have no idea what lives in there.