Acknowledgements
All procedures conducted in this study comply with the current National and Provincial laws, and were approved by the University Bioethics Committee. This study was funded by Wildlife Conservation Society (Wildlife Health Fund, www.wcs.org), Morris Animal Foundation (www.morrisanimalfoundation.org, Grant No. D08ZO-304), and CONICET (www.conicet.gob.ar, Grant No. PIP11220100100261). We would like to thank Dr. Martín de la Peña for the ornithological. The authors declare no competing interests.