Figure 3
Mean number of pine nuts cached per trial (±SEM) by the birds (n = 10) during each caching experiment.
(a) During Experiment 1 the birds cached alone, in the presence of an conspecific, with a regular mirror, and with a blurry mirror. (b) During Experiment 2 the birds cached alone, in the presence of a conspecific, and with a half mirror that covered one vertical half of the cage. (c) During Experiment 3 the birds cached alone, in the presence of a conspecific, and with the full sized mirror. Trials were run concurrently with devoted mirror exposure sessions provided throughout the week. **p < 0.01 ***p < 0.001.
