National Geographic : 1946 Jul
The National Geographic Magazine A Pileolated Warbler's Anxious Eye Gleams over Naked Young True inhabitants of the Canadian zone at 10,000 feet are these hardy birds. They range northward beyond the Arctic Circle. Their inconspicuous nests are tucked away on the ground or in low shrubbery. O National Geographic Society Kodachromes by Alfred M. Bailey and Robert J. Niedrach Feeding Young Pine Grosbeaks Is a Job for Both Parents Here three mouths yawn hungrily. Adults gorge themselves on insects and marigold seed, then feed the nestlings by regurgitation. Pine grosbeaks nest in high conifers at about 11,000 feet.