Acknowledgments
We thank Laura Lobasso, Giovanni Ghirlanda, Carl-Adam Wachtmeister and Noel
Holmgren for their help. The research was supported by grants from the Swedish
Science Research Council and Marianne och Marcus Wallenbergs Stiftelse.
We thank Angela K. Turner at Animal Behaviour and Stuart Moffat at Aca-
demic Press for returning us the diskette with the manuscript: our copy was lost
in a computer accident.
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