Happy, a Bronx Zoo elephant who gave researchers new insight into the animal's behavior and became the crux of a closely ...
Happy made history in 2005 by passing a mirror self-recognition test, a milestone for elephant cognition research ...
The Cool Down on MSN
Happy the Bronx Zoo elephant, who changed what scientists knew and sparked a rights battle, dies at 55
Zoo officials said she spent her final weeks in an off-exhibit barn and yard within her enclosure by her own choice.
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