Why do some zoos euthanize healthy animals?
European zoos often put down healthy animals to maintain genetic diversity in a species’ population, but the practice doesn’t occur in U.S. zoos. Why? It all comes down to birth control.
http://www.mnn.com/earth-matters/animals/stories/why-do-some-zoos-euthanize-healthy-animals
WARNING: Disturbing and outrageous.
How do you maintain genetic diversity by making the population smaller, therefore less diverse?