One is a Snail, Ten is a Crab: A Counting by Feet Book by April Pulley Sayre and Jeff Sayre with illustrations by Randy Cecil. If one is a snail, and two is a person... we must be counting by feet! Children will love this hilariously illustrated introduction to simple counting and multiplication with big feet and small - on people and spiders, dogs and insects, snails and crabs - from one to one hundred!