Before Coby died, there was already nobody home signs. The zoo said that she had a fracture on her bone and I guess that she was not out shortly before she passed was because of the fracture. Coby was 16 years old which was very old for a wolf and she lived a good life. Also when was the last time you saw Coby outside in her habitat?Well that answers the question of the "nobody home" signs posted at her exhibit.
Elderly Gray Wolf Dies at Smithsonian’s National Zoo