The DataZip file contains the following objects 1) “Attributes” gives the identity of all sighted individuals with attributes (ID, sex and size) followed by the number of time it was observed (Present), the number of times it was captured (Capture) and probability of capture (Pcap), 2) “group_by_individual” gives the matrix denoting which individuals were detected in which group at the selective survey site. The columns give the individuals, the rows give the number of the group.