This challenging worksheet asks first graders to classify animals like a scientist through four multiple choice questions about which group lays eggs and has feathers (birds), which group a frog belongs to (amphibians), which animal breathes with gills (trout), and what covers a reptile body (scales). Five fill in the blanks then cover a dolphin as a mammal not a fish, six legged insects, cold blooded reptiles, an owl as a bird, and a caterpillar turning into a butterfly. The harder examples stretch first graders past easy cases and prepare them for true vertebrate study later on.