Any of many South American monkeys of your genera Saguinus and Leontopithecus, possessing silky fur plus a nonprehensile tail: quite a few species are threatened or endangered.: See also pinche2, golden lion tamarin. Thinking about a scaled-down form of monkey? Perhaps a common marmoset monkey, also called a finger monkey, https://exoticpetsworldwide.com/product/buy-tamarin-monkeys-online/