Biography
Zookeepers noticed, after observing Santino behind blind glass, that the chimp had been busy stockpiling ammunition in anticipation of the visitors, dragging stones from a protective moat and even thumping chunks of concrete into rough discs. He made the piles of stones only on the part of his island facing the crowds and his behaviour shows that forward planning isn't a uniquely human trait.
To control his behavior, and keep his hormone levels down, zookeepers castrated Santino. Since then, Santino has been observed to be more playful and is growing a "Buddha belly".
Read more about this topic: Santino (chimpanzee)
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