Fox in Socks is a children's book by Dr. Seuss, first published in 1965. It features two main characters, Fox (an anthropomorphic fox) and Knox, who speak almost entirely in densely rhyming tongue-twisters. The book in some ways bears a resemblance to Green Eggs and Ham, another book by Dr. Seuss. Both stories contain two main characters: one who is stubborn and wants to be left alone; the other, a persistent and sometimes annoying opposite.