5/25 & 5/26 - 7 th grade agenda collect hw: homework: reading & notetaking p. 235 – 238...
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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
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Reflection
• Prompt: Write 3 questions that you have about birds.
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What are some characteristics of Birds?
• Endothermic vertebrate
• Feathers• Lay eggs• Most can fly• Four chambered
heart• Scales on feet and
legs
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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?
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What adaptations allows birds to fly?
• Feathers• Hollow bones
(light weight)• Large chest
muscles• Wing shape
allows lift
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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?
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Do birds have teeth?
• Birds have no teeth.
• What you see are not really teeth.
• It lacks the hard enamel of teeth
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• 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
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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
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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
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How does bird’s wing shape affect flight?Bird’s wing shape creates lift
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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
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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
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Do Dolphins have hair?
• Yes. Near their blow holes
• Most of the hair disappear when they get older
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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
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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
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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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You can tell the type of food mammals eat by its skull & teeth.• What type of food
does this animal eat?