You could go to the site and tie trail tape 36" off the ground , or 45 or 60 . I f its under the 36 its small , just under the 45'' its big, just under the 60''..... run away its going to eat you HA HA. seriously though The bear I shot last spring ,its back was almost at the top of a 45 gal drum( Saskatchewan, we can bait) about 44 '' and he was about 380lbs. I'm sure weight can vary lots but at least you will have a visual reference to go by. have fun