What are irregular plurals? You'll find the answer inside this book - full of ponies, teeth, potatoes, and geese! Brian P. Cleary's whimsical rhymes give helpful guidelines for forming plurals when the usual rules of adding s or es don't apply. Feet and Puppies, Thieves and Guppies: What are Irregular Plurals? turns traditional spelling lessons on end. Listen and share in the delight of the sense - and nonsense - of words.