National Geographic : 1937 Aug
FEATHERED FORAGERS OF SWAMP AND SHORE () National Geographic Society LEARN THEIR NAMES BY WATCHING WHAT THEY DO The American Oyster-catcher (lower left) and the Black Oyster-catcher (lower right) clip the muscles of partly opened oysters so that they cannot close again. The smart birds then feast at leisure. In the search for insects and tasty crawling morsels, the Ruddy Turnstone (right center pair; adult in summer garb above young in fall plumage) continually flips over shells, stones, and debris, a habit shared by the Pacific's Black Turnstone (upper left pair, in winter and summer plumage). The Surf bird (upper pair, in winter and summer dress) spends most of the year close to the pounding breakers.