Predation Danger Can Explain Changes in Timing of Migration: The Case of the Barnacle Goose Jonker, Rudy M. ; Eichhorn, Götz ; van Langevelde, Frank ; Bauer, Silke Abstract Publication: PLoS ONE Pub Date: June 2010 DOI: 10.1371/journal.pone.0011369 Bibcode: 2010PLoSO...511369J