Climbing the walls

Last week we had an old friend of my father's come and stay with us for a few days. I spent a considerable amount of time cleaning baseboards and door frames and walls before his visit. There was dirt everywhere! I couldn't figure out how so much dirt was on door frames and walls....the answer has been solved. I captured one culprit the other day...I'll give you one guess who the other one is...hint...athletic, gymnast, name starts with H....in the future when I use the phrase "they are climbing the walls...it is ok to take that literally!!