I think @dvt's comment above is a good attempt at answering this question. I agree with him that intrinsic motivation and a capacity for suffering, hope and al

I think @dvt's comment above is a good attempt at answering this question. I agree with him that intrinsic motivation and a capacity for suffering, hope and all the other emotions (which we share with pretty much all animals, if not plants too) are at the top of the list. Cleverness is there also, but not at the top of the list.