Group Dynamics of Zebra and Wildebeest in a Woodland Savanna: Effects of Predation Risk and Habitat Density Thaker, Maria ; Vanak, Abi T. ; Owen, Cailey R. ; Ogden, Monika B. ; Slotow, Rob Abstract Publication: PLoS ONE Pub Date: September 2010 DOI: 10.1371/journal.pone.0012758 Bibcode: 2010PLoSO...512758T