I recently adopted petey from a member of this forum and I brought him to my vet when I first got him. He recieved a clean bill of health but today I just noticed something crawling through his feathers. These little black things. My vet checked him for mites I don't even know if these are mites. I've had him in a play pen outside to get fresh air could he have got them then I'm so lost please help my vet is closed.