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 476-485 HW: Reading & Notetaking p.235 – 237 Reminder: Chap 12 Test on 5/28& 5/29

Reflection Prompt: Write 3 questions that you have about Birds.

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

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?

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

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

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

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

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

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

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

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

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

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

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

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

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

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