On the Socio-Sexual Behaviour of the Extinct Ursid Indarctos arctoides: An Approach Based on Its Baculum Size and Morphology Abella, Juan ; Valenciano, Alberto ; Pérez-Ramos, Alejandro ; Montoya, Plinio ; Morales, Jorge Abstract Publication: PLoS ONE Pub Date: September 2013 DOI: 10.1371/journal.pone.0073711 Bibcode: 2013PLoSO...873711A