1. 5/21 & 5/22- 7th Grade Agenda
Learning Objective: Learn about Birds & Mammals
Collect HW: Reading & Notetaking p. 233 – 234
Chap 12 Study Guide
BBC Life (Birds)
Textbook Reading
HW: Reading & Notetaking p.235 – 237
Reminder: Chap 12 Test on 5/28& 5/29

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?
Birds have two type of feathers. How are their use different?
Contour Feathers
Down 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
How does bird’s wing shape affect flight?

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?