I have a three month old RN dove who is with me for a week or so. I noticed that when she came in, she had green stains on her tail feathers and then noticed that all of her droppings were bright to dark green. I did not give her any veggies. She gets bird seed and grit and oyster shells once in awhile. She is not stressed by other animals and is very tame. Any suggestions as to what the green droppings are?