A fun-filled book of idioms from around the world that will spark the imagination of readers everywhere and encourage them to delight in language. You've probably heard the expression “when pigs fly," but did you know that in Spain they say “when frogs grow hair" and in Nigeria “when chickens have teeth"? A rib-tickling collection of idioms from around the world. But the question is: will you believe them...? Derby Children's Book Award Longlist 2021. For ages 3 . Hardcover, printed on sustainably-sourced paper with soy-based inks.