I just thought this was too funny.
"Gorillas on Weight Watchers? Polar bears slurping sugar-free Jell-O shots? Giraffes nibbling alfalfa biscuits?
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The days of letting visitors throw marshmallows to the animals are mostly history at zoos around the country, replaced by a growing focus on diet and nutrition that parallels the fitness craze in humans.
And thanks to mounting research on wild animals' food needs, today's zoo staffers are trying new feeding tricks to keep their lions and tigers and bears healthy and happy.
Avoiding obesity is part of the program."
(for the rest of the article, see the link below)
http://news.yahoo.com/s/ap/20080317/...me/zoo_diets_3
There's even a mention of them trying to get lions to exercise.

