Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Robert E. Ricklefs, Department of Biology, University of Missouri at St. Louis
8001 Natural Bridge Road, St. Louis, Missouri 63121-4499, USA
Eldredge Bermingham, Smithsonian Tropical Research Institute
Unit 0948, APO AA 34002-0948, USA or Apartado Postal 2072, Balboa, República de Panama