Great Gray Owls, at about 24 inches in length, are North America’s largest owl by length but, not by weight. We watched this Great Gray Owl move from perch to perch over a four-hour period on our last afternoon at Sax-Zim Bog as he sometimes dozed and sometimes listened for prey beneath the snow. When he chose this perch in a spindly leafless shrub close to the ground, a perch that seemed so flimsy I was surprised the owl stayed there, it must have seemed ideal because he performed a balancing act, twirling around until he finally settled down and balanced perfectly on the twig.