Okay kiddo, do you know what a plantigrade is? No? That's okay, I'll explain it to you!
You know how you sometimes walk on your toes, like a ballerina? Or how sometimes you walk on your whole foot and your toes, like when you walk barefoot on the grass? Well, a plantigrade animal is an animal that walks on its whole foot, like humans do!
Some animals like dogs and cats walk on their toes only, while others like bears and humans walk on their whole foot. When an animal walks on its whole foot, it is called plantigrade.
So when you're walking around outside, take a look at the animals you see and think about whether they're plantigrade, walking on their toes, or something else. It's pretty interesting, isn't it?