We started out with 6ft. chicken wire. Had a deer clear one side of the turkey pen and tear out the opposite side (didn't even pause). Wouldn't have believed it if we hadn't been sitting in the kitchen looking out the window. Switched over to 1"x2" 6ft. welded wire and were glad we did (big lab tried it's darndest to get to the chooks and turks). The welded wire also keeps the toms from completely rubbing off all the feathers on their breasts.