" So, how does a carnivore get around when he's not chasing something? Hint: reptile and bird claws do not retract."
What I meant was if you were following animal tracks that showed pad and claw prints and then suddenly the claw impressions became deeper and the pad impressions were shallow or disappeared it would indicate that the animal was running.
Ahhh... I think the paleontologists probably took that into account, too.
That's not what the article said ...