Fill in the Blanks Vertebrates GroupsOnline version Write the correct answer in the space provided. by Waldina Lopez 1 Mammals amphibians birds fish fish invertebrates vertebrates Invertebrates Amphibians reptiles reptiles mammals Birds Vertebrates Animal kingdom is divided into two main groups , and . are all animals that have a backbone . doesn't have backbone . The 5 groups are : , , , , and feed on milk . are the only group that have feathers . The only group that can live on water is the group . Snakes are examples of . are the only group that can live on land and on water .