who knows? Walker behavior is erratic.
One picked up a brick and broke the glass in Atlanta.
One would return to her house and try to open the door every night.
One left a herd to enter a disabled camper and have a look around
probably other's I forgot.
Teddy Bear walker in the opening of the series premier, and Sophia covering her eyes when she exits the barn and the sun hits her. Personally... I wouldn't mind seeing a 1 in 10,000 walker that could pathfind. Imagine the horror on our heroes' faces when they stand on one edge of a pit and watch Walkers walk right over the edge, only to see one stop, stare down the ravine and look left and right and see a bridge and head to it, only to have the mindless walkers follow their primitive herd instincts and follow him.