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People walk down the street while Hurricane Matthew approaches in Port-au-Prince, Haiti October 3, 2016. (Photo by Carlos Garcia Rawlins/Reuters)

People walk down the street while Hurricane Matthew approaches in Port-au-Prince, Haiti October 3, 2016. (Photo by Carlos Garcia Rawlins/Reuters)
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04 Oct 2016 10:23:00
A model presents a creation for the Amir Slama collection during Sao Paulo Fashion Week in Sao Paulo, Brazil, October 26, 2016. (Photo by Nacho Doce/Reuters)

A model presents a creation for the Amir Slama collection during Sao Paulo Fashion Week in Sao Paulo, Brazil, October 26, 2016. (Photo by Nacho Doce/Reuters)
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28 Oct 2016 10:18:00
“Teenager Teenager”, an installation by the collaborative Chinese artists Sun Yuan and Peng Yu, at the exhibition “Crazy. Madness in contemporary art” in Rome on February 18, 2022. (Photo by Gloria Imbrogno/LiveMedia/Rex Features/Shutterstock)

“Teenager Teenager”, an installation by the collaborative Chinese artists Sun Yuan and Peng Yu, at the exhibition “Crazy. Madness in contemporary art” in Rome on February 18, 2022. (Photo by Gloria Imbrogno/LiveMedia/Rex Features/Shutterstock)
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30 Apr 2023 03:27:00
A woman along with her children carry hay to feed cattle in Sanjar Chang village, Mirpurkhas district in Sindh province on April 9, 2023. (Photo by Asif Hassan/AFP Photo)

A woman along with her children carry hay to feed cattle in Sanjar Chang village, Mirpurkhas district in Sindh province on April 9, 2023. (Photo by Asif Hassan/AFP Photo)
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02 May 2023 03:05:00
A woman walks past a graffiti mural, showing a child protecting with a Ukrainian flag against the war, made by artist ChemiS, on March 19, 2022 in Prague. (Photo by Michal Cizek/AFP Photo)

A woman walks past a graffiti mural, showing a child protecting with a Ukrainian flag against the war, made by artist ChemiS, on March 19, 2022 in Prague. (Photo by Michal Cizek/AFP Photo)
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03 May 2023 02:48:00
Costumed pigs jump over a brush head while training for a forthcoming race at Monk Park Farm, Thirsk, North Yorkshire, United Kingdom on April 24, 2023. (Photo by James Glossop/The Times)

Costumed pigs jump over a brush head while training for a forthcoming race at Monk Park Farm, Thirsk, North Yorkshire, United Kingdom on April 24, 2023. (Photo by James Glossop/The Times)
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16 May 2023 04:07:00
Animals Yawning

In animals, yawning can serve as a warning signal. For example, Charles Darwin, in his book The Expression of the Emotions in Man and Animals, mentioned that baboons yawn to threaten their enemies, possibly by displaying large canine teeth. Similarly, Siamese fighting fish yawn only when they see a conspecific (same species) or their own mirror-image, and their yawn often accompanies aggressive attack. Guinea pigs also yawn in a display of dominance or anger, displaying their impressive incisor teeth. This is often accompanied by teeth chattering, purring and scent marking.

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11 Aug 2012 09:12:00


United States Marine Corps Staff Sgt. Jason Itro yells at recruit Nancy Carbins January 15, 2003 after she grabbed another recruit in the pool in an attempt to stay afloat during swim training at the Combat Pool on Parris Island, SC. Under the watchful eyes of swim instructors, recruits are required to swim in full gear and learn limited strokes and breathing to stay afloat. Carbins broke a major rule by grabbing another recruit and submerging them both. (Photo by Stephen Morton/Getty Images)
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29 Jul 2011 12:20:00