As described by the authors:
Source: Richard Barker, University of Otago, New Zealand
Description: Data from a capture-recapture study conducted on the
Otago Penninsula, South Island, New Zealand. Fur seal pups were
marked and released during 7 census attempts in one season. The
population is assumed closed. For each census attempt, the number of
pups captured and the number of these captures corresponding to pups
never previously caught are recorded.