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An empty cell block is pictured within Joint Task Force Guantanamo's Camp VI at the U.S. Naval Base in Guantanamo Bay, Cuba March 22, 2016. (Photo by Lucas Jackson/Reuters)

An empty cell block is pictured within Joint Task Force Guantanamo's Camp VI at the U.S. Naval Base in Guantanamo Bay, Cuba March 22, 2016. (Photo by Lucas Jackson/Reuters)
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24 Mar 2016 12:02:00
An Israeli Air Force F-35 fighter jet flies during an aerial demonstration at a graduation ceremony for Israeli airforce pilots at the Hatzerim air base in southern Israel December 29, 2016. (Photo by Amir Cohen/Reuters)

An Israeli Air Force F-35 fighter jet flies during an aerial demonstration at a graduation ceremony for Israeli airforce pilots at the Hatzerim air base in southern Israel December 29, 2016. (Photo by Amir Cohen/Reuters)
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30 Dec 2016 10:44:00
LA-based model Tori Brixx at the BET Awards 2023 held at Microsoft Theater on June 25, 2023 in Los Angeles, California. (Photo by Broadimage/Rex Features/Shutterstock)

LA-based model Tori Brixx at the BET Awards 2023 held at Microsoft Theater on June 25, 2023 in Los Angeles, California. (Photo by Broadimage/Rex Features/Shutterstock)
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11 Jul 2023 03:08:00
People look at a collection of vintage cars during the Expo Transporte event at the Francisco de Miranda Air Base in Caracas on December 7, 2025. (Photo by Juan Barreto/AFP Photo)

People look at a collection of vintage cars during the Expo Transporte event at the Francisco de Miranda Air Base in Caracas on December 7, 2025. (Photo by Juan Barreto/AFP Photo)
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20 Dec 2025 11:30:00
BASE jumper Luke Denniss of Australia gestures as he dives in the air from the Kuala Lumpur Tower during the KL Tower International Jump in Kuala Lumpur, Malaysia, Saturday, September 27, 2014. BASE stands for the places such jumpers usually jump from: buildings, antennas, spans (bridges) and earth (cliffs). (Photo by Lai Seng Sin/AP Photo)

BASE jumper Luke Denniss of Australia gestures as he dives in the air from the Kuala Lumpur Tower during the KL Tower International Jump in Kuala Lumpur, Malaysia, Saturday, September 27, 2014. BASE stands for the places such jumpers usually jump from: buildings, antennas, spans (bridges) and earth (cliffs). (Photo by Lai Seng Sin/AP Photo)
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27 Sep 2014 12:12:00
Base jumper Denis Odintsov from Russian leaps from the 300-meters Open Deck of the Malaysia's landmark Kuala Lumpur Tower during the International Tower Jump in Kuala Lumpur on September 27, 2013. Some 103 professional base jumpers from 20 countries are taking part in the annual event. (Photo by Mohd Rasfan/AFP Photo)

Base jumper Denis Odintsov from Russian leaps from the 300-meters Open Deck of the Malaysia's landmark Kuala Lumpur Tower during the International Tower Jump in Kuala Lumpur on September 27, 2013. Some 103 professional base jumpers from 20 countries are taking part in the annual event. (Photo by Mohd Rasfan/AFP Photo)
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28 Sep 2013 09:30:00
Giant pandas are playing and foraging inside the Shenshuping base of China Conservation and Research Center for the Giant Panda in Wolong National Nature Reserve on November 3, 2021 in Aba Tibetan and Qiang Autonomous Prefecture, Sichuan Province of China. Shenshuping base sits in Aba Tibetan and Qiang Autonomous Prefecture and is committed to the panda's breeding and reproduction. It is the largest conservation and research center for giant pandas along with the bases in Dujiangyan and Ya'an cities in Sichuan. (Photo by An Yuan/China News Service via Getty Images)

Giant pandas are playing and foraging inside the Shenshuping base of China Conservation and Research Center for the Giant Panda in Wolong National Nature Reserve on November 3, 2021 in Aba Tibetan and Qiang Autonomous Prefecture, Sichuan Province of China. (Photo by An Yuan/China News Service via Getty Images)
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09 Nov 2021 07:23:00
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