Thesaurus realizes, through his actions, that hiding things isn't the answer. He should be true to who he is and there will be people (or, in this case, dinosaurs) who accept him. He even finds himself a leader of sorts as a result. The book also presents a nice moral in that it captures the power of getting swept up in the excitement of reading about new and interesting worlds that can pave the path to exciting adventures and discussions throughout life.
A sweet and friendly story, 'Thesaurus Has a Secret' has adorable illustrations and a host of book titles filled with dinosaur puns that will make any book lover smile.