GLYN GOODWIN / SCIENCE PHOTO LIBRARY GLYN GOODWIN / SCIENCE PHOTO LIBRARY
Elephant self-awareness. Conceptual artwork of an elephant with a painted X-symbol on its forehead recognising itself in a mirror. Researchers painted such crosses on elephant foreheads, and some recognised themselves in a mirror. Elephants, along with humans, the great apes, and dolphins, are the only animals known to be capable of this degree of self-awareness.
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