Animal Kingdom - Vertebrates

3. larges living land mammal
6. animals with shelled egg, scaly skin, and efficient circulatory and respiratory systems; includes lizards and snakes, turtles, and crocodiles and alligators
7. only mammal that can fly
10. egg covered with a protective shell and has several internal membranes with fluids contained between the memebranes
12. order of cats and dogs
16. allows fish to get oxygen when water that enters their mouth flows across this part
17. the amount of time the young stay in the uterus before they are born
18. vertebral column
20. pouched mammal
22. time period of worldwide mass extinction of many species including dinosaurs
23. specialized outgrowths of the skin of birds
25. a saclike muscular organ in which embryos develop
26. animal with a backbone
27. order of whales and dolphins
28. produce and secrete milk

1. animal with jaws, paired fins, scales, and gills
2. a paddle-shaped structure on a fish used for balance, steering, and propulsion
3. animals that cannot regulate its body temperature and must get heat from its environment
4. order of mammals that includes humans
5. animals with four legs, moist skin with no scales, gas exchange through the skin, and lungs; includes frogs, toads, salamanders, and newts
8. an organism that generates its body heat internally by its own metabolism
9. small, flat, platelike structure near the surface of the skin
11. tough, flexible material making up the skeletons or parts of skeletons of vertebrates
13. has feathers and can fly
14. mammals that reproduce by laying eggs
15. saclike structure that senses odors in snakes
19. animals that have mammary glands, hair, and are endothermic
21. an organ that provides food and oxygen and removes waste from the developing young
24. smallest of all mammals
29. class of birds