International zoo organization recommended euthanasia as a well-known procedure in zoos for old sick animals which do not respond to treatment (not curable) to let them rest in peace in a humanitarian way which save expenses for feeding, treatment, & care besides having them displayed raise pity and disgust the zoo visitors instead of enjoying their visit to zoos.

Unfortunately this procedures are not allowed at Egyptian Zoos yet.

It is recognized that wild animals longevity is increased in captivity due to good care and nutrition at zoos.