The Burgess Animal Book For Children in "Thunderfoot, Fleetfoot And Longcoat"

"Who remembers the name of the order to which all members of the Deer family belong?" asked Old Mother Nature.

"I remember what it means, but not the name," spoke up Happy Jack Squirrel. "It means hoofed."

"It is Un Un-Ungu " began Ryder Rabbit and then stopped. For the life of him he couldn't think of the rest.

"Ungulata," Old Mother Nature finished for him.