1. SCIENCE 7 TOPIC 13

2. WARM-BLOODED VERTEBATES INCLUDES THE BIRDS AND…

3. …WARM-BLOODED VERTEBRATES ALSO INCLUDES THE MAMMALS

4. Warm-blooded vertebrates maintain a constant body temperature

5. Warm-blooded vertebrates have very complex body systems such as…

6. …and digestive system to name just two

7. THE MAIN BIRD TRAIT IS FEATHERS

8. CONTOUR FEATHERS

9. THE MAIN BIRD TRAIT IS FEATHERS DOWN FEATHERS CONTOUR FEATHERS

10. WHY ARE BIRDS CAPABLE OF FLIGHT?

11. Lightweight but strong skeletal structure

12. Air sacs

13. Crop

14. Complex 4-chambered heart

15. Streamlined shape

16. WHY DO BIRDS MIGRATE?

17. WHY DO BIRDS MIGRATE? Too cold and/or …

18. WHY DO BIRDS MIGRATE? Too cold and/or the food supply becomes scarce

19. HOW DO BIRDS MIGRATE?

20. Its not fully understood, but…

21. HOW DO BIRDS MIGRATE?

25. Birds reproduce via internal fertilization  Embryo

26. Short incubation time - organism is more dependent at birth (sparrow)

27. Longer incubation – less dependent at birth (ducks)

28. Traits of Mammals Mammals are the most successful group of animals.

29. Mammals have hair or fur to insulate their bodies except for… Whales (blubber) and elephants (thick skin)

30. Mammals have mammary glands to produce milk for their young

31. Mammals have internal fertilization and development of their young

32. Mammals have a four chambered heart

33. Mammals have a very complex nervous system

34. Mammals have three main types of teeth: incisors, canines, and premolars and molars

35. There are three classes of mammals. The first are the monotremes. These lay eggs and their body temperatures vary much more than other mammals. The spiny anteater and duckbilled platypus are two monotremes

36. The second group of mammals is the marsupials. These bare their young in an undeveloped state with final development taking place in a pouch. Examples include the kangaroo, koala, and opossum.

37. The third group of mammals is the placentals. Young are completely developed at birth having received nourishment from the placenta. These include: 1. the insect eaters-shrews and moles

38. 2. bats which fly and use sonar…

39. 3. rodents-the largest group including beavers and hamsters whose incisors grow constantly

40. 4. rodent-like with strong hind legs like the rabbit and the prairie dogs

41. 5. aquatic mammals with fins, flippers, and streamlined bodies like the whales and dolphin

42. 6. toothless mammals like the anteater and armadillo

43. 7. meat-eating mammals like the dog, cat, and seal

44. 8. hoofed plant eating mammals like the horse and deer

45. 9. the elephants with trunks-males have tusks

46. 10. primates with opposable thumbs and most complex brains

47. 11. The seventh graders with their goofy behavior