People walk plantigrade, meaning that when we take a step the entire sole of the foot reaches the ground, from the toes to the heel. Not so, cats. Their locomotion is digitigrade, which is to say that their heels do not touch the ground. That provides them with both agility and speed, say, when they want to escape a predator or catch their next meal. It’s a more stealth way of ambulating as it’s a relatively quiet movement.
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