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Contents

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Frequency, Timing and Costs of Intraspecific Nest Parasitism in the Common Eider
Gregory J. Robertson, Michelle D. Watson, and Fred Cooke

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Vocal Advertising and Sex Recognition in Eared Grebes
Gary L. Nuechterlein and Deborah Buitron

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Demography of a California Least Tern Colony Including Effects of the 1982-1983 El Nino
Barbara W. Massey, David W. Bradley, and Jonathan L. Atwood

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Book Reviews
Raymond Pierotti

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News and Notes
The Condor

Covers

Short Communications

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Vocalizations of Nestling Leach's Storm-petrels
Christopher T. Naughler and Peter C. Smith

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Hematological Values for Four Species of Birds of Prey
F. J. Polo, J. F. Celdran, V. I. Peinado, G. Viscor, and J. Palomeque

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Temporal Relationships in White-throated Sparrow Song
Daniel M. Weary and Ronald G. Weisman

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Song Sparrows Learn from Limited Exposure to Song Models
Susan Peters, Peter Marler, and Stephen Nowicki

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Territorial Position in Sharp-tailed Grouse Leks: the Probability of Fertilization
Leonard J. Tsuji, Daniel R. Kozlovic, and Marla B. Sokolowski