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Written and created by Mitchell Moffit (twitter @mitchellmoffit) and Gregory Brown (twitter @whalewatchmeplz).
Further Reading —
Yawning as a Brain Cooling Mechanism:
http://www.albany.edu/news/pdf_files/Yawning_Report_Gallup_May_2007.pdf
Chimpanzees and contagious yawning:
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3534187/
Familiarity-connected or stress-based contagious yawning in domestic dogs:
http://www.ncbi.nlm.nih.gov/pubmed/23982621
Contagious yawning, social cognition, and arousal: an investigation of the processes underlying shelter dogs’ responses to human yawns:
http://www.ncbi.nlm.nih.gov/pubmed/23670215
The thermoregulatory theory of yawning:
http://www.ncbi.nlm.nih.gov/pubmed/23293583
Male yawning is more contagious than female yawning among chimpanzees:
http://www.ncbi.nlm.nih.gov/pubmed/22808234
Mirror neuron activity during contagious yawning–an fMRI study:
http://www.ncbi.nlm.nih.gov/pubmed/22772979
Thermoregulatory theory of yawning:
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3534187/