Preliminary observations were taken between 13 October
and 6 November 2005 and used to design the food presentation
treatments and data collection strategy. The enclosure was
observed for time periods between 100 and 360 min after food
presentation on 4 days, with the activities of each individual
recorded every 60 s. These observations showed that animals
were most active in the first 30–40 min post-feeding, with
activity levels then dropping to near zero and remaining low
for up to 2.5 h after. During the experiment, we used observation