Fig. 4.

Logistic regression curves of the proportion of observations in which hens were classified into each of four binary behavioural categories, over days from enrichment withdrawal: a) Active, b) Looking, c) Cage-Pecking and d) Foraging. Data at 0 on the x axis corresponds to baseline data. On the y axis, 1 indicates an observation of the behaviour with 0 for any other behaviour. Due to the large number of data points, the mean ± 1 S.E. per sampling day are instead shown for clarity. Shading represents the confidence interval.