All of the books in the Literacy Out of the Box series have been chosen for their outdoor settings and because they lend themselves easily to Learning for Sustainability across the curriculum.
Horton Hears a Who! An Introduction
You may also wish to take a look at the Learning at Home pages for Horton Hears a Who! You will recognise some of the activities from the Mind Map but alternatives have been provided for working at home or as an individual.