... Animals as Sentinels of Environmental Health Hazards presents an overview of animal-monitoring programs, including detailed case studies of how animal health problems such as the effects of DDT ... important. Areas that must beaddressed include the nature of the problem, the objectives of the study, thedefinition of the event and unit of observation, characterization of the system,sources of data, ... potential for greater exposure of animals at the top of the food chain—including humans—than of animals lower in the food chain.Because food animals are part of the food chain, they are monitored...