This was just too cute (and funny!) not to share. I came across a blog in Scientific American that discussed a "standardized test" created by Hannah Bonner, illustrator and children's writer, to help determine whether someone (or some creature) is a mammal:
The test is part of her book called "When Dinos Dawned, Mammals Got Munched, and Pterosaurs Took Flight." What a great educational tool. It is published by National Geographic Children's Books. Kudos to you Hannah!
But I have a lower jaw made of two fused bones. Apparently I am not a mammal. What am I? --Yes, I know this is geared towards kids. But the bright ones will know this.