Nimble Deer in "An Interrupted Nap"

"Yes! Yes!" said his mother. "Now listen to what I say: A Fox is red. And his tail has no rings at all. And Foxes don't climb trees."
"Yes, Mother!" was Nimble's meek answer. He was glad to learn all that. And he was glad, too, that his mother hadn't asked him how he happened to stray off alone into the woods.