The nature can be cruel because it cleans up its weak animals. We now know that the strongest individuals of a species in nature evolve through an admirable adaptability and reproduce. Birds in cages, poultry, pigs, cows and fish live in captivity. This book describes how caged birds and livestock diseases develop to a greater extent, which can also be transmitted to humans. The expansion in the intensive livestock and poultry farming threatens the health of us all. More antibiotics are given to animals than to our patients. The pharmaceutical industry has taken full advantage. Patient care is booming and is likely to be prohibitively expensive.