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ACKNOWLEDGMENTS
We are grateful to P. Bishop, L. Boitani, S. Clelland, P. Guilford,
Y. van Heezik, M. Knight, D. Mallon, R. Maloney, A. Moehrenschlagar,
N. Mooney, J. Olden, M. Stanley Price, and two anonymous
referees, who variously shared their insights, facilitated access
to literature or images, or gave valuable feedback on early
versions of the manuscript. K. Miller assisted with formatting
the figures.
10.1126/science.1251818
