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).