 Furthermore, the type of attention-getting behaviour matched the inattentiveness of the playmate.Stronger attention-getting behaviours were used when a playmate was looking away or distracted, less forceful ones when the partner was facing forward or laterally,

An experiment at the University of Bristol found that one out of ten pigs was possibly able to understand what other pigs can see.That pig observed another pig which had view of a maze in which food was being hidden, and trailed that pig through the maze to the food.