Deer Facts

  • Unmanaged deer herds have the potential to double in size every 2 years*
  • There is no effective birth control for free-ranging deer+
  • High deer populations lead to high Lyme disease rates*
  • Fairfield County has the highest number of new cases of Lyme per year in CT*
  • Connecticut has the highest rate of Lyme disease in the US*
  • There  were over 4000 deer-vehicle accidents/ day in the US in 2007
  • Woodlands can only support 10 to 15 deer per square mile without suffering damage+
  • Deer are causing loss of native bird and plant species due to overbrowsing+
  • Local Fairfield County towns have up to 69 with some pockets of over 100 deer per square mile †
  • At less than 10 deer per square mile Lyme ticks have difficulty breeding and virtually disappear* #
  • Deer reduction could dramatically reduce Lyme disease within 5 years in a typical town
  • Deer reduction virtually eliminated Lyme disease from several New England communities already^

* source: CT Department of Public Health/CT Agriculture Experiment Station 2007
+source: CT Department of Environmental Protection and FDA
†source: CT DEP's January 2009 Aerial Deer survey# source: CT Agriculture Experiment Station 2007, Harvard School of Public Health, and Maine Medical Center

^ source: DEP's Managing Urban Deer in Connecticut and Cornell University's publication "Community based deer management: A Practitioners' Guide"

For full article and explanation of the correction factors used in the new deer density survey of Fairfield County see: Connecticut Wildlife May/June 2009 pp2-3  on the Ct DEP web site:

New Estimates for Deer Density in Fairfield County.