Elephants Friendship 32 Pigs 32 Gerald (Fictitious character : Willems) 18 Humorous stories 14 Animals 10 Birds 6 Conservation 6 Emotions 6 Fables 6 Bullies 4 Christmas 4 Cooperativeness 4 Folklore 4 Imagination 4 Kings, queens, rulers, etc 4 Mice 4 Parties 4 Wildlife conservation 4 Anger 2 Athletes 2 Automobile travel 2 Babar (Fictitious character) 2 Babies 2 Behavior 2 Best friends 2 Board books 2 Books and reading 2 Bullying 2 Children's stories, English 2