I have the "cotton balls with legs" too and I have flukes (mine are red & like the pictures & were in the stool sample I sent to my doctor where I was diagnosed with liver flukes after analysis). I just dropped off a fresh load of the 'cotton balls with legs' to the lab earlier today (as I'm having more stool tests & worm IDs). My doctor agreed that they look quite suspiciously like something parasitic but was unsure what they were; they Only come out when flukes are coming out. But I also have Ascaris so I don't know. And, I don't eat bananas & I had been on a clear liquid diet for weeks when I expelled them.