The mouse (Microtus pennsylvanicus) data were first discussed in Nichols, Pollock and Hines (1984). The original live-trapping experiment was conducted monthly from June to December, 1980. During each month, the capture-recapture procedure was repeated for 5 consecutive days.
The detailed data are given in Williams, Nichols and Conroy (2002, pp. 525-528). We use the data collected in June. A total of 104 distinct mice were caught in the experiment.