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Come to the Philadelphia Zoo this summer for FREE. The intent is to have teachers visit then plan to bring their students on a field trip later in the year. The Philadelphia Zoo is the nations first zoo and has made many improvements of the past several years.
In addition, their education department has a summer institute for teachers as described in this link.
Begin your trip with the Discovery video “Beyond the Bars: Zoos and Zoo Animals (1987)”. There are blackline masters, a teacher’s guide and a quiz you can use with your class too!