What Guides a Search for Food That Has Disappeared? Experiments on Cotton-Top Tamarins (Saguinus oedipus)

When food is launched down a vertically positioned S-shaped opaque tube, cotton-top tamarins (Saguinus oedipus) search for the food in the position directly beneath the release point, even though over several trials it never appears in this position (B. M. Hood et al., 1999). Experiment 1 showed that when the trajectory of the food shifts […]