Animal Behavior Frozen in Time: Gregarious Behavior of Early Jurassic Lobsters within an Ammonoid Body Chamber Klompmaker, Adiël A. ; Fraaije, René H. B. Abstract Publication: PLoS ONE Pub Date: March 2012 DOI: 10.1371/journal.pone.0031893 Bibcode: 2012PLoSO...731893K