I have had an unfortunate run lately losing one bird to Mareks and 4 others showing the weight loss symptoms. All are rescues so I don't know their vaccination history, however two of the sick birds were rescued from a commercial facility so I assumed they would have been vaccinated. One girl just pooped right in front of me and it has these glob of worms shown below. I am starting to think that only two birds had Maerks and the others might just have worms. (Yeayyy...I think) However, I heard that wormers are hard on their systems so I don't want to just do trial and error with the wormer since they are so skinny and compromised anyway. I had TWO fecal test done at the local vet last week and both came back negative. So I am now turning to my BYC experts. Can you help me identify these worms so I can get the appropariate wormer? (I currently use feed grade DE in the litter but not in their food) When they are not moving they look like little round balls. The part that does move (the head?) starts out round and then reaches out to a point. I have more pictures if you need them. Thank you, thank you!