Midway between the lair of the Bengal tigers and the stamping ground of the African elephants at the San Francisco Zoo is an attraction more commonly seen along city sidewalks: a parking meter. But drop a quarter in and you get a lot more than 30 minutes of parking time. When a donor turns the handle of the modified meter, a mechanical red-throated hummingbird flies across a jungle scene, signaling that the donation will be used to save a small plot of tropical rain forest.
The Conservation Meter was the brainchild of zookeeper Norman Gershenz, who came up with the notion...
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