Statistics are shown for individuals that visited devices at least once (Visited), and for those that had pecked at least one key (Pecked). Individuals not recorded on the regular grid of feeders (N =
Field notes including image and/or video records. The primary objective of this field visit was to obtain a nearly exact reference video for the 20 September 2014 observation of multiple animals. Sele
GA: Gaze Alternation. ML: Mouth Licking. *Corrected regarding relative size of the areas. Obs: Gaze Alternation was only measured in absolute frequency, and variables that involved areas were only mea
Total focal animal sampling time, in hours, for each dyad, in the 12 months preceding Tuck's death. Used as the denominator for the calculation of rates of grooming bouts.
Observed animals [sex (F = female, M = male); age in years or months (mo)] during the study period in 2010. Animals showing the throw-kiss-display are marked in capital letters; animals showing puff-b