ISBN-13: 9781786275660, 978-1786275660. 1 to 20 Animals Aplenty Author(s): Katie Viggers. 1 to 20 Animals Aplenty is a delightful counting book that takes young readers from 1 to 20 - from dogs who have pet frogs and snakes who love to eat cakes to gorillas looking at mirrors and llamas wearing pyjamas!