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In the present day, the spider monkey does have advantages over other animals. They can still use their tail but I think that their tail will be fully mobile in the course of a hundred years. They currently have really good hearing but in the future I think it will have extremely good hearing . I think that in the course of 100 years the spider monkey will have a tail that has a use for mobility and to hunt and I think the spider monkey will also have big ears that can hear infrasound so that it can hunt really well.