Volume 276 Number 1658 / March 07, 2009 of Proceedings of the Royal
Society B: Biological Sciences is now available on the
journals.royalsociety.org web site at http://www.journals.royalsoc.ac.uk.
This issue contains:
Echolocating bats emit a highly directional sonar sound beam in the
field p. 853
Annemarie Surlykke, Simon Boel Pedersen, Lasse Jakobsen
A female songbird out-sings male conspecifics during simulated
territorial intrusions p. 981
Anya E. Illes, Laila Yunes-Jimenez
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