Craig Armstrong has found the purr-fect climbing partner - his cat Millie.
''She literally loves to climb things... if there's high-ground she'll seek it out," Armstrong told Bored Panda. ''Generally she does best on slabby routes where she can scramble from ledge to ledge.''
Armstrong, who lives in Salt Lake City, Utah, said he never thought it was odd to take his cat mountaineering.
''Just seemed like something I'd do with my pet, take her places.''
In fact Armstrong says Millie has all the qualities he wants in a climbing partner.
''She never complains, no matter how bad it gets,'' he wrote on Backcountry.com, where he works. ''She always wants to go higher, and she pushes herself hard. But she also knows when to stop. When she's done, she's done. She'll find a cave or climb a tree and won't move until she's rested.''