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

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

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?

Give shape to a bird’s body

And help them fly

Contour Feathers Down Feathers

Traps heat and keep the bird warm

Which feather is used for insulation inside jackets and sleeping bags?

Do birds have teeth?

• Birds have no teeth.

• What you see are not really teeth.

• It lacks the hard enamel of teeth

• 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

How birds digest

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

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?