Also birds for bipedalism. At the extreme we have ostriches and emus. BTW: cockatoos also have strikingly manipulative feet, which they use in combination with

Also birds for bipedalism. At the extreme we have ostriches and emus. BTW: cockatoos also have strikingly manipulative feet, which they use in combination with their beak (though they can't use both feet simultaneously). And a surprisingly high brain/body ratio. Although they lack a prefrontal cortex, birds have separately developed a different structure, called the hyperpallium. There's no necessary barrier for birds evolving sapience independently from our line (any more than for aliens) - and there's no reason that the architecture of our brains must be better/more efficient.