Document is current

Article History

Received: 1 November 2015

Revised: 14 January 2016

Accepted: 16 January 2016

First Online: 26 January 2016

Compliance with ethical standards

: All applicable international, national, and/or institutional guidelines for the care and use of animals were followed in research performed by the authors. Our research protocols were reviewed and approved by the Cornell University IACUC (most recent Protocol 2007-0124) and by the University of Copenhagen, which enforces the Guidelines for the Treatment of Animals in Behavioral Research established by the Animal Behavior Society. In addition, the authors submitted protocols and received approval for all research in Costa Rica from the directorate of the Área de Conservación Guanacaste (most recent permit ACG-PI-035-2007). No human subjects were involved in any study undertaken by the authors.

: Original research by the two authors of this review (including personal observations) was supported by the National Science Foundation of the United States (IBN 02-290271 to JWB), the Steno-Stipend program (272-06-0272 to TJSB), and Framework programs of the Danish Council for Independent Research (272-07-0477 and 10-08484 to colleague Torben Dabelsteen). All other citations in this review involve research undertaken by other authors and published separately.

: The authors declare that they have no competing interests.