Their favorite types of forests are peat swamp and dipterocarp forests. They live in rainforests across the islands of Indonesia and Malaysia. These great apes have relatively particular habitat needs. For example, if they can trade a tool for five pieces of fruit, they will feel cheated when they trade it and receive a single piece of fruit. Studies of orangutans in zoos have given us unrivaled information about what these creatures can learn.One study determined that orangutans can understand and use “calculated reciprocity.” This basically means that the orangutans can understand what something is “worth” and will know if proposed trade is sufficiently valuable.
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