All in the family.
The Evolution of Sibling Rivalry by D.W. Mock and G.A. Parker Oxford University Press, 1998. $120.00 hbk, $55.00 pbk (xiii +464 pages) ISBN 0 19 857743 5/0 19 857744 3.
Dept of Organismic and Evolutionary Biology, Harvard University, Cambridge, MA 02138, USA.
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