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Pygmy marmosets are the smallest known monkeys reaching at most 14 cm. They may be the smallest primate but their tail is definitely not small, especially compared to the rest of their body used to balance in trees but in the future they may not have any trees to balance on. In a thousand years or so they may also get skinnier/unhealthy because as of today its diet is not only tree sap and fruit but also insects and spiders which may go extinct by then, even the tree sap and fruit may become rare because of global warming. As their climate changes they adapt to it, for example, today they fur is full of colors, for camouflage but in a thousand years or so their colors may change depending on their new environment. Soon they may not even live in troops as they do today.