Brodbeck, David R.; Brodbeck, Madeleine I. R.; and Rosso, Keeghan (2019) Domestication and cognitive complexity. Animal Sentience 25(32)
Lori Marino and Debra Merskin, Intelligence, complexity, and individuality in sheep
Marino and Merskin (2019) list a number of tasks that sheep can perform well. As comparative psychologists, we are not surprised by these results. Indeed, many domesticated animal species show similar abilities.