This medium worksheet asks first graders to fill in nine sentences naming a lizard as a reptile, a bee as an insect, a horse as a mammal, and penguins as birds that cannot fly, plus features like fish fins, warm blooded mammals, snakes with no legs, tadpoles growing into frogs, and spiders having eight legs. A four pair matching activity then links a shark to fish, a robin to bird, a ladybug to insect, and a rabbit to mammal, helping children see how scientists sort animals by their bodies and behaviors.