Fill in the Blanks Animal World ReviewOnline version Read the paragraph about the animal world. Choose the correct answer to fill in the blanks. by Carmile Gilbert 1 birds four six milk warm lungs blooded vertebrates Species invertebrates fish fur Animals with backbones are called . Mammals are - animals . Animals with no backbones are called . mean different kinds of animals . Mammals make for their babies . Mammals have limbs . The five types of vertebrates are mammals , , amphibians , reptiles , and . God created animals on day . Mammals breathe with their . Many mammals have and hair .