National Geographic : 1937 Jul
BIRDS OF A DIFFERENT FEATHER FLOCK TOGETHER AT THE AUTHORS' HOME IN WASHINGTON, D.C. Nine birds of prey, captured by the Craighead boys and their friends, perch together peaceably enough so long asthey are kept apart. When hungry, the larger ones would attack the smaller if allowed within reach. The backyard aviary includes, left to right: a sparrow hawk, young female duck hawk, barred owl, two great horned owls (on arched perches), old male duck hawk, young male duck hawk, another sparrow hawk, and a screech owl. All the birds are trained infalconry except the two young duck hawks.