http://en.wikipedia.org/wiki/Behavioral_enrichment
http://nationalzoo.si.edu/SCBI/AnimalEnrichment/
http://www.honoluluzoo.org/support-the-zoo/environmental-enrichment-program.html
http://www.hilozoo.com/enrichment.php
http://conservation.wrs.com.sg/index05.html
Video
http://www.kitv.com/news/hawaii/Talented-chicken-plays-piano-at-Honolulu-Zoo/24614348
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