| 21. | Willy the killer whale, Cheetah the chimp and King Kong?
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| 22. | A zookeeper places a worm-filled tube above the chimps.
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| 23. | A zookeeper placed a worm-filled tube above the chimps.
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| 24. | The leap from chimp to man could have been around 1930.
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| 25. | The chimps range in age from 9 to 40 years old.
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| 26. | Her studies have helped revolutionize humanity's understanding of chimps.
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| 27. | People grow crops near the chimp areas and encroach on them.
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| 28. | But how chimps came to have SIV has been a mystery.
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| 29. | The 39 chimps " could end up spread around the world.
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| 30. | At Ta? chimps simply use their hands to extract termites.
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