Ruler is the larvae of geometer moths. This book use ruler as the taxi driver and who will write on him? He is taking ladybug to the wedding, mama snail and little to the hospital... Let's bring parents and children together to read this fun story.Ruler is the larvae of geometer moths. This book use ruler as the taxi driver and who will write on him? He is taking ladybug to the wedding, mama snail and little to the hospital... Let's bring parents and children together to read this fun story.