Assessing the spontaneous use of human-given cues in ground-hornbills.

A wide range of species relies on heterospecific visual cues to detect the location of resources like food. Although different hypotheses have been suggested to explain the emergence of this capacity in animals, results are often difficult to interpret due to the influence of other factors, such as close contact with humans. In this study, we presented eight Southern ground-hornbills (Bucorvus leadbeateri) with a two-way object-choice paradigm.