Managed care is the new environment in which mental health care will be delivered. In biology, environments determine which species flourish and thrive, and which dwindle and decline. Harsh environmental changes may cause some species to disappear altogether, as has the dinosaur and the snail darter. Ecological environments nurture and support certain species but not others. Some species thrive on what an environment provides, and others cannot adapt to the sustenance available. Survival is a dance between the environment and the organism. Compatibility defines survival.