(1) Their hands had only three digits: two fingers and an opposable thumb.(2) A panda with a fully opposable thumb that is lacking in its nearest relatives is hard to explain via evolution.(3) In other words, our ancestral rodents did not merely evolve gradually until they emerged as bipeds with opposable thumbs.(4) Digits 1 and 2 on the forefeet are opposable to digits 3-5, and the hindfoot has a well-developed hallux.(5) The first 2 digits of their forefeet are opposable to the other three in the more arboreal species.
