text: where to reply to national parks system, i am a usa citizen, ..re: killing of elk in rockies national  park?   i am guessing that you are attempting to report the killing of an elk within the park boundaries.  park rangers are in charge of law enforcement within the national park system. i would recommend contacting  jim capps, supervisory park ranger for rocky mountains np. his phone number is 970 586-1518 and his e-mail is jim_capps@partner.nps.gov.