FEATHERED BABY SITTERS AND CO-OP NURSERY NESTS

D. Davis, 1940, _Auk_, Vol. 57, p. 179 (ani). A. C. Bent, 1925, _U.

S. Natl. Mus. Bull._, 130, p. 85 (eider duck). R. C. Murphy, 1936,

_Oceanic Birds of South America_, Vol. 1, p. 398 (penguins).