11. Examine the prepared slide of the down feather under low power. Locate the barbs and barbules. Switch your microscope to high power, and make a separate, labeled drawing of the down feather in your lab report. Does it resemble the one in the figure above?

12. A- Clean up your materials, and wash your hands before leaving the lab.

Analysis and Conclusions

1. What is the function of the shaft? What is the function of the vanes and barbs?

2. How do hooks increase the strength and air resistance of a feather?

3. How is the structure of the quill feather related to its function of aiding flight?

4. Based on your observations, why might down feathers be more effective at keeping a bird warm than the other two feather types you observed?

5. Based on your observations, how do you expect to see these feathers arranged on a bird? Explain how position of the feather affects the function of the feather.

6. What evolutionary pressure(s) would have caused the evolution of these different types of feathers?

Further Inquiry

Each of the feather types you have examined has a specific structure and function. Review your observations, and try to think of features that account for the efficiency of the three types of feathers.

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