VEKTEBEATA. 93 



3. Observe the peculiar markings and coloring of your 

 specimen. 



B. Head. 



1. What is the shape of the beak? 



2. Exactly where are the " corners of the mouth " ? 



3. Are any hair-like structures around the mouth? 



4. From the appearance of the beak what do you infer 



is the natural food of this bird ? 



5. What is the exact position of the nostrils? 

 C. Are the nostrils protected in any way ? 



7. Are the eyes protected in any way except by the 



eyelids ? 



8. Locate the bird's ears. Are they protected ? 



C. Wings. 



1. Compare the length of the wings from shoulder to 



tip with that of the entire bird from the tip of 

 the beak to the tip of the tail. (Make record.) 



2. To what part of the skeleton are the wing-feathers 



attached? (Dem.) 



3. Explain the advantage of the fan-like arrangement of 



the wings. 



D. Tail. 



1. What is the use of the tail? (Recall to mind birds 



that you have seen in flight.) 



2. How does a bird's tail differ essentially from a tad- 



pole's tail ? 



3. How does a bird's tail diflrer essentially from a cat's 



tail? 



E. Feet. 



1. How many toes on each foot? 



2. How are the toes arranged? 



