The local humane company is ACE Wildlife Services - # (240) 505-6043, email GriffinWorks@adelphia.net. They were specially trained in HSUS program in Canada. They offer free estimates and 1-5 year guarantees, and will offer advice. ( ACE stands for Animal Community Environment)..Located in Maryland but will work in DC and Virginia."Humanely solving your wildlife issues...Removal from attics, chimneys, etc., Family reunion, Exclusion, Prevention, etc...."