National Geographic : 1936 Apr
THE NATIONAL GEOGRAPHIC MAGAZINE Fj I atonal 'teograpnzc society STRONG-WINGED SWALLOWS SNATCH THEIR MEALS FROM A TABLE OF AIR Wasps, flies, and beetles, many of them crop destroyers, are targets of the swooping, triangular-billed purple martins (upper group, male left, female right, young male flying). Largest of the swallow tribe, these aerial acrobats, which often drive off crows and hawks, are always welcomed by farmers, who erect for them many-roomed apartment boxes in poultry yards. The cliff swallow (flying below) is a cliff dweller in the West, but in the East it builds mud nests under barn eaves. The barn swallow (right) nests inside on the rafters.