PLOS ONE10(5),e0128133(2015), DOI10.1371/journal.pone.0128133. Primary publisher byline Virginia Alonso Roldán, Luisina Bossio and David E. Galván verified. Abstract, Introduction and Methods: independently searched warrens and video counts; warren and individual detectability, abandoned warrens and observation duration. No conservation-status update inferred.