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Sources:
https://www.ncbi.nlm.nih.gov/pubmed/26236256
http://www.med.upenn.edu/csa/assets/user-content/documents/PNAS-2009-Glocker.pdf
http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0046362
https://www.researchgate.net/profile/Oriana_Aragon2/publication/271503312_Dimorphous_Expressions_of_Positive_Emotion_Displays_of_Both_Care_and_Aggression_in_Response_to_Cute_Stimuli/links/54e8e35c0cf2f7aa4d52e8cc.pdf
Image Sources:
https://commons.wikimedia.org/wiki/File:Konrad_Lorenz.JPG