You need to get those droppings into the vet so they can check for parasites and blood.
You might even take the birds too. Something isn't right.
What is their environment like? Is it really dusty? Do you have anything that has a strong odor near them? Is their housing clean?
You might even take the birds too. Something isn't right.
What is their environment like? Is it really dusty? Do you have anything that has a strong odor near them? Is their housing clean?