Ticks are widespread in the countryside and in areas of rough vegetation and forestry and are not confined only to National Parks or Nature Reserves. Ticks can be found on a variety of domesticated and wild animals including sheep, goats, horses, cattle, dogs, deer and various wild mammal species.
While, not confined to the Killarney National Park, information on ticks for members of the public intending to visit the Park is contained in the health and safety section of the dedicated website:
http://www.killarneynationalpark.ie/visit/health-safety. Information on Lyme Disease is available from the HSE and, their booklet
http://www.hpsc.ie/a-/vectorborne/lymedisease/informationforthepublic/Lyme%20DL%20April2017%20-%20D2.pdf contains useful information in this regard.