My female cockatiel died today morning, yesterday night she was fine, today when i went to their cage, she was making a very weird noise, and her mouth was bloody. I get her out of the cage put her in top of the cage and ran to bring a separate cage. When i returned, i saw she was having trouble to keep her balance in the top of the and fallen to the floor. blood coming out of her mouth and nostril. she moved 1 or 2 times and died.