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Lecture 16 Wrld Dnsr
Predators Take Wing
| Question | Answer |
|---|---|
| How many species of bird are there? | 10,000 |
| Who is the oldest bird dinosaur and in what location was it found? | Archaeopteryx, Germany 1860 |
| Which other dinosaur was so closely related to archaeopteryx that it helped prove the evolution theory? | Compsognathus |
| Which dinosaur was the "missing link" to relating birds back to dinosaurs? | Archaeopteryx |
| What three hypotheses have been proposed for the origin of birds and who were they proposed by? | 1. The Basal Archosaur Hypothesis (Gerhard Heilmann) 2. The Crocodilian Hypothesis (Alick Walker) 3. The Therapod Hypothesis (Thomas Huxley and John Ostrom) |
| Explain The Basal Archosaur Hypothesis | Related birds back to more primitive reptiles since dinosaurs did not possess a clavicle. Birds have furculas (or wishbone) |
| The Crocodilian Hypothesis: | Birds are most closely related to early crocs. |
| The Theropod Hypothesis: | Birds are closely related to dinosaurs due to the many pieces of evidence like Archaeopteryx and Compsognathus |
| What is the "Trees-down model"? | Based on the idea that Archaeopteryx was tree-living, evolved body parts that enabled it to glide, and eventually flapped and took off into flight. This doesn't work bc Archaeopteryx has to take minor risks to reach flight |
| What is the "Ground-up model"? | Archaeopteryx was ground-living and used it's feathers to catch insects. |
Created by:
Chelseagirl2508
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