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5/25 & 5/26 - 7 th Grade Agenda

5/25 & 5/26 - 7 th Grade Agenda. Collect HW: Homework: Reading & Notetaking p. 235 – 238 Birds & Mammals Snail Lab Video: BBC Life (Birds) Textbook Reading 483-494 Homework: Reading & Notetaking p.239 – 242 Reminder Bring Moss back on 5/31 & 6/1 for 5 points Extra Credit. Reflection.

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5/25 & 5/26 - 7 th Grade Agenda

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  1. 5/25 & 5/26 - 7th Grade Agenda Collect HW: Homework: Reading & Notetaking p. 235 – 238 Birds & Mammals Snail Lab Video: BBC Life (Birds) Textbook Reading 483-494 Homework: Reading & Notetaking p.239 – 242 Reminder Bring Moss back on 5/31 & 6/1 for 5 points Extra Credit

  2. Reflection • Prompt: Write 3 questions that you have about birds.

  3. What are some characteristics of Birds? • Endothermic vertebrate • Feathers • Lay eggs • Most can fly • Four chambered heart • Scales on feet and legs

  4. What were the ancestors of birds? • Dinosaurs • This is a picture of Archaeopteryx lived about 145 million years ago • How is archaeopteryx different from modern birds?

  5. What adaptations allows birds to fly? • Feathers • Hollow bones (light weight) • Large chest muscles • Wing shape allows lift

  6. Birds have two type of feathers. How are their use different? Which feather is used for insulation inside jackets and sleeping bags? Down Feathers Contour Feathers Give shape to a bird’s body And help them fly Traps heat and keep the bird warm

  7. Do birds have teeth? • Birds have no teeth. • What you see are not really teeth. • It lacks the hard enamel of teeth

  8. How birds digest • Crop: allows them to store food inside the body after swallowing it • Gizzard: squeezes and grinds the partially digest food • Gizzard contain many small stones

  9. Parental Care • The partridge chicks find their own food from the day they hatch. • The blue jay chicks are featherless, blind, and totally dependent on their parents for food for several weeks

  10. What are Owl Pellets? • Owls do not have teeth and swallow preys whole • Owl’s stomach digests everything except the skeleton • So the owl throws up skeleton as Owl Pellets

  11. How does bird’s wing shape affect flight? Bird’s wing shape creates lift

  12. Physics of Bird’s Flight • Bernoulli's Principle • Faster an air move, less pressure it exerts • The difference in pressure above and below the bird’s wing produce an upward force that causes the wing to rise

  13. Characteristics of Mammals • endothermic vertebrates • four-chambered heart • skin covered with fur or hair. • Most mammals are born alive • young mammal is fed with milk

  14. Do Dolphins have hair? • Yes. Near their blow holes • Most of the hair disappear when they get older

  15. What are the function of hair and fur? • Fur and hair prevent body heat from escaping • Helps maintain a stable body temperature in cold weather • Animals in cold regions have thicker coats of fur

  16. When did the first mammals appear? • About 270 Million years ago • They were small mouse like animals • After the dinosaurs disappeared about 65 million years ago, larger mammals evolved

  17. You can tell the type of food mammals eat by its skull & teeth. • What type of food does this animal eat?

  18. You can tell the type of food mammals eat by its skull & teeth. • What type of food does this animal eat?

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