The famous ironic smile of a bottlenose dolphin. As noted by Lori Marino, such smile is not a smile at all but an anatomical illusion arising from the configuration of their jaws, making people believe that the animals are always content ("Sorry: Dolphins Aren’t Smiling", Reader's Digest Magazine February 2014). Yet, this particular young animal not only looked content, but he probably was: free, undisturbed, and surrounded by group members and friends.
(Photo by S. Bonizzoni, Gulf of Corinth, Greece)
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