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“Large glass windows had been installed in the exhibit, and the orangutans took to pitching rocks at them. San Diego officials, thinking quickly, instituted an exchange program. One non-thrown stone would get you a banana. But the orangutans were not interested and kept trying to break the windows. The park finally had to bring in a contractor to dig up the entire ground floor of the exhibit in order to remove all of the rocks, as each shattered window cost the zoo $900 to replace. What happened next? The orangutans began to tear the ceramic insulators off of the wall and threw them instead. Evidently, these animals really wanted out.” — Jason Hribal
Large glass windows had been installed in the exhibit, and the orangutans took to pitching rocks at them. San Diego officials, thinking quickly, instituted an exchange program. One non-thrown stone would get you a banana. But the orangutans were not interested and kept trying to break the windows. The park finally had to bring in a contractor to dig up the entire ground floor of the exhibit in order to remove all of the rocks, as each shattered window cost the zoo $900 to replace. What happened next? The orangutans began to tear the ceramic insulators off of the wall and threw them instead.
Evidently, these animals really wanted out.