Clutton-Brock, T. (2016). The evolution of social behavior in mammals. Journal of Mammal Evolution, 23(2), 151-164.

de Waal, F. B. M. (2016). The Age of Empathy: The Lessons of a New World from an Old Planet. Harmony Books.

Broom, D. M. (2007). Welfare and behavioral needs of animals. Journal of Applied Animal Welfare Science, 10(3), 243-254.

Bekoff, M. (2002). Animal Emotions: Exploring Passionate Natures. New York: HarperCollins.

Wemelsfelder, C. (2005). Animal boredom and enrichment. Journal of Applied Animal Welfare Science, 8(3), 257-269.

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Clutton-Brock, T. (2016). The evolution of social behavior in mammals. Journal of Mammal Evolution, 23(2), 151-164.

de Waal, F. B. M. (2016). The Age of Empathy: The Lessons of a New World from an Old Planet. Harmony Books. Clutton-Brock, T

Broom, D. M. (2007). Welfare and behavioral needs of animals. Journal of Applied Animal Welfare Science, 10(3), 243-254. 151-164. de Waal

Bekoff, M. (2002). Animal Emotions: Exploring Passionate Natures. New York: HarperCollins. Clutton-Brock, T

Wemelsfelder, C. (2005). Animal boredom and enrichment. Journal of Applied Animal Welfare Science, 8(3), 257-269.