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21 Cards in this Set
- Front
- Back
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how many species of birds are powered by fight/flight?
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9000
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What is aves?
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class of vertabrees.
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What are some features unique to birds?
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hollow bones, lightly contructed,
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what does braces and struts provide for birds? (diamgram)
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structural support for thin walls
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what does long bones being PNEUMATIC mean?
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air passes through small openings in the bones when the bird respires (breathes).
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What do the air sacs in birds do to them?
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lightens them, hold oxygen in body.
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BIRD BONES=
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HOLLOW
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Which was the first bird ?
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Archaeopteryx (SINGLE FEATHER)
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Where did fossils of the first bird (archaeopterryx) come from?
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Solnhofen Limestone
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Why did the archaeopteryz lack flight muscles?
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no sternum
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THese two hypothsis show how what? Arboreal and Cursorial
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how flight originated
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Aboreal Hypotheiss was?
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bird lived in trees and used feathers to glide from branch to branch. Claws used for climbing
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Cursorial hypotheisis was?
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they lived on the ground and were fast runners. feathers were used for insulation and arms were used to catch prey
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why did the aboreal (trees) hypotheses get critized.(wings and legs),
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wings and gliders are different. hind legs are those for fast runners
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why did the cursorial (ground) hypotheisis get critisized? (hands, why flap?)
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cant catch with feathered hand. flapping would slow down.
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what are ratites?
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giant flightless birds.
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WHen did extiction of dinos occur?
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end of cretaceous gto tertiary boundry. (KT)
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What are a few possible causes of the extiction of dinos?
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1. climate was too cold- couldnt hibernate
2.Climate too hot-roasted 3. poiseness plants *4. longest runinng reason: SUPERNOVA- generated radiation. 5. Parasites (flees) 6. sea level dropped 7. Asteroid |
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What was maastrichtian?
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the last period of the cretaceous.
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What is the process?
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produces the pattern/
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there are 2 patterns constructed in western n. america. what were they?
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1. gradual disappeareance of dinos over few million years.
2. sudden catastrophic extinction of dinos. |
