They may be pretty wildlife, but they can also be a Lyme disease-carrying nuisance and driving hazard. The region's deer population and how it's managed continues to be the subject of debate. In the past several years, the National Park Service and regional parks managers have used controlled hunts to thin deer numbers. But animal rights advocates object, saying there are more humane and effective methods that should be considered, like long-term birth control vaccinations. We explore the issues.