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In 2021 spider monkeys are 14 to 26 inches and weigh 13.25 pounds. A Lot of spider monkeys live in the trees of tropical rain forests between North America and South America. They eat 90% fruit and seeds. In 1000 years, there will not be as much water and less trees. Humans are cutting trees down and the Earth is getting warmer. Spider monkeys who are losing their food will not have the fruit and seeds they need. They will adapt and need to eat bugs. I think they will be 26 to 34 inches tall and if they did weigh 13.25 pounds, they will weigh 58 pounds 1000 years later. This is because they would swing in trees but now, with less trees their legs are longer and they walk more. Now that they eat bugs they have more protein which causes them to be heavier.