Maria Svensson-Coelho,^1,2 John G. Blake,^1,3 Bette A. Loiselle,^1,3 Amanda S. Penrose,¹ Patricia G. Parker,¹ Robert E. Ricklefs<sup>1

1</sup>Department of Biology, University of Missouri—St. Louis, One University Boulevard, St. Louis, Missouri 63121, USA
²Present address: Departamento Genética e Biologia Evolutiva, Instituto de Biosciěncias, Universidade de São Paulo, Edifício André Dreyfus, Rua do Matão, 277, São Paulo, Brazil. E-mail: mariasve@usp.br
³Present address: Department of Wildlife Ecology and Conservation and Center for Latin American Studies, 110 Newins-Ziegler Hall, P.O. Box 110430, University of Florida, Gainesville, Florida 32611, USA.