7th Grade Ch. 3 Sec. 4 Reptiles


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7th Grade Ch. 3 Sec. 4 Reptiles

  1. 1. CH. 3 SEC. 4 REPTILES
  2. 2. ectothermic vertebrate have lungs scaly skin lay eggs on land 3 chambered heart
  3. 3. <ul><li>All reptiles are ectothermic, which is why they warm themselves in the sun. </li></ul>
  4. 4. ways reptiles conserve water 1. eggs <ul><li>shell & membrane (amniotic sac) protect embryo </li></ul><ul><li>keep it from drying out </li></ul>2. skin <ul><li>dry, tough </li></ul><ul><li>keeps water in </li></ul>3. kidneys <ul><li>concentrate urine </li></ul>
  5. 6. major groups of reptiles <ul><li>lizards </li></ul><ul><li>snakes </li></ul><ul><li>turtles </li></ul><ul><li>alligators and crocodiles </li></ul><ul><li>(crocodilians) </li></ul>
  6. 7. lizards shed their skin as they grow most live in warm areas 4 legs external ears
  7. 9. Reptile defenses <ul><li>Some kinds of lizards have tails that will break off when grabbed by an attacker. (They later grow back.) </li></ul><ul><li>The lizard escapes, while the attacker is left with just the tail. </li></ul>
  8. 10. <ul><li>Horned Lizard This is one of the grossest creatures around ! </li></ul><ul><li>When the Horned Lizard gets really scared, it shoots blood out of its eyes by increasing the blood pressure in its sinuses until they explode. </li></ul><ul><li>Ouch! The blood doesn't hurt the lizard's enemy but it really freaks them out, so the Horned Lizard has time to escape. </li></ul>Horned lizards can squirt a stream of blood as far as 3 feet at an attacker.
  9. 11. snakes No legs No eyelids No external ears most have only 1 lung carnivores
  10. 12. Northern Copperhead (a venomous snake)
  11. 14. Ouch !
  12. 15. Venomous Eastern Coral Snake Harmless Scarlet Kingsnake Bands: Yellow - Red - Yellow -Black- Yellow - Red Bands: Yellow -Black- Red -Black- Yellow -Black Venomous or not? Can you tell the difference?
  13. 16. Dumeril's Ground Boa
  14. 17. Playing Dead Among North American snakes, the Eastern Hognose has the most impressive defense behavior. When threatened, it flattens its head and neck like a cobra and hisses loudly. It may strike but rarely bites. If all this fails, the snake rolls over, writhes as if in pain, opens its mouth, sticks out its tongue, and plays dead. It is a real actor; you can pick it up and it will remain limp, but when you set it down, it will flop over onto its back again.
  15. 18. Turtles <ul><li>body covered by protective shell </li></ul><ul><ul><ul><li>made from its spine & ribs </li></ul></ul></ul><ul><li>most turtles & tortoises can pull their heads back into their shells </li></ul>
  16. 19. largest turtles= leatherbacks
  17. 20. Leatherback turtles can weigh over 500 kilograms (about 225 lbs).
  18. 21. Females come ashore in bands and lay their 60 to 100 eggs in holes that have been dug in the sand. Seven weeks later, when the eggs hatch, the babies rush back to the water. 
  19. 22. A painted turtle is about to eat a mayfly - yum!
  20. 23. <ul><li>largest reptiles (in size) = </li></ul><ul><li>alligators & crocodiles </li></ul>American Alligator American Crocodile
  21. 24. Crocodilians are carnivores that hunt mostly at night.
  22. 25. dinosaurs <ul><li>extinct reptiles- 65 million years ago </li></ul><ul><li>paleontologist - scientist who studies extinct organisms by using fossils- </li></ul><ul><li>occur most often in sedimentary rock </li></ul><ul><li>evidence of living thing that existed a long time ago </li></ul>