Animal Masterminds is a great nonfiction book. This book has short chapters on different animals, from horses to crows and what these animals can really do. This book would be great for third grade or higher science class. You don't even have to read the entire book in one setting. Read each chapter base on the unit you are covering.
If you do read the entire book, have your students pick one animal from the book and draw a poster. On the poster, put the name of the animal, a drawing of the animal, and a few facts about the animal that they learned from the book. You can even allow students to pick an animal that is not in the book and have them do research about the animal of their choice and do the poster over that animal. After they make their posters, have them present their posters.