C. G. Sibley, 1946, _Condor_, Vol. 48, p. 92; Coles, 1937, _Proc. Zool. Soc. London_, 1937, pp. 261-73; Fleay, 1937, _Emu_, Vol. 36, pp. 153-63 (mound builders). CORMORANT FISHING B. Laufer, 1931, _Publ. Field Mus. Nat. Hist. (Anthr. Ser.)_, 18, pp. 201-62; Gudger, 1926, Amer. Nat., 60, p. 5 (cormorant fishing). THE SHRIKE'S LARDER A. C. Bent, 1950, _U. S. Natl. Mus. Bull._ 197, p. 120 (shrike's larder). BIRD FLAVORS H. B. Cott, 1946, _Proc. Zool. Soc. London_, Vol. 116, pp. 371-524 (bird flavors). HOW MANY FEATHERS HAS A BIRD? A. Wetmore, 1936, _Auk_, Vol. 53, p. 159; F. B. Hutt and L. Ball, 1938, _Auk_, 55, p. 651 (number of feathers). LAST YEAR'S BIRDS' NESTS A. C. Bent, 1925, _U. S. Natl. Mus. Bull._ 130, pp. 91, 92; H. F. Lewis, 1938, _Bird-Lore_, Vol. 40, p. 239 (eider down). SYMBIOSIS--ANIMALS LIVING IN MIXED HOUSEHOLDS A. C. Bent, 1938, _U. S. Natl. Mus. Bull._ 170, pp. 384-86, 398 (burrowing owl). H. Friedmann, 1930, _Natural History_, Vol. 30, p. 205 (social weaver). W. H. Hudson, 1920, _Birds of La Plata_, Vol. 2, p. 31 (monk parrot). W. R. B. Oliver, 1930, New Zealand Birds, p. 118 (_Sphenodon_). BIRD APARTMENT HOUSES A. C. Bent, 1942, _U. S. Natl. Mus. Bull._ 179, p. 490 (purple martin). A. Wetmore and F. C. Lincoln, 1933, _Proc. U. S. Nat. Mus._, Vol. 82, art. 25, p. 44 (West Indian woodpecker). D. Bannerman, 1933, _Birds of Tropical West Africa_, Vol. 3, p. 381 (barbets). J. T. Emlen, 1954, _Auk_, Vol. 71, p. 16 (cliff swallows). W. H. Hudson, 1920, _Birds of La Plata_, Vol. 2, p. 31 (monk parrot). A. Wetmore and B. H. Swales, _U. S. Natl. Mus. Bull._ 155, p. 346 (palm chat); H. Friedmann, 1930, _Nat. Hist._, Vol. 30, p. 205 (social weaver). BIRD HELPERS AT NESTING TIME A. Skutch, 1935, _Auk_, 52, p. 257 (helpers at nest). M. M. Nice, 1943, _Trans. Linn. Soc._, Vol. 6, p. 79 (young feeding young). R. C. Murphy, 1936, _Oceanic Birds of South America_, Vol. 1, p. 360 (emperor penguins). WEAVERS AND TAILORS IN THE BIRD WORLD H. Friedmann, 1922, _Zoologica_, Vol. 2, p. 355 (weaverbird). C. A. Wood, 1926, _Smithsonian Rept._, p. 349 (tailorbird). SOCIAL PARASITES AMONG BIRDS A. H. Miller, 1946, _Sci. Monthly_, Vol. 62, p. 238 (social parasites). FISH EATS BIRD! W. E. Glegg, 1945, _Ibis_, p. 422 (fish eating birds). CROWS ARE SMARTER THAN "WISE" OWLS A. L. Rand, 1943, _Canad. Field Nat._, Vol. 57, p. 35 (saw-whet owl). A. L. Rand, 1942, _Bull. Amer. Mus. Nat. Hist._, 79, p. 518 (blue jay). A. C. Bent, 1946, _U. S. Natl. Mus. Bull._ 191, p. 196 (raven), p. 266 (crow). TAME WILD BIRDS D. Lack, 1942, _Ibis_, p. 271 (flycatcher). A. H. Chisholm, 1943, _Ibis_, p. 105 (honey eaters). H. H. Brimley, 1934, _Auk_, 51, p. 237 (phoebe). BIRDS AS PILFERERS A. L. Rand, 1954, _Fieldiana-Zoology_, Vol. 36, p. 31 (pilfering, several species). HIBERNATION IN BIRDS