THE FROG AS AN INTRODUCTION TO MAN 205 



Conclusions. 1. What in the frog corresponds to the pec- 

 toral fins in the fish ? To the pelvic fins ? 



2. How is the resting position of the hind legs of especial 

 advantage ? 



3. How are the hind legs fitted for swimming ? 



4. Would it be well for a person to pattern after a frog in 

 learning to swim ? Explain. 



5. Tell how the hind legs are especially fitted (adapted) for 

 jumping. 



6. Tell how a frog is adapted for life on land. For life in 

 water. 



c. Adaptations for Food Getting 



Observations. 1. Touch various parts of a frog gently with 

 a splint or pencil. How does it respond ? 



2. Compare the external position and shape of a frog's eye 

 with that of the fish you studied. Is the eye more movable ? 

 Is it better protected ? 



3. Just back of the eye find a large drumlike organ (ear 

 drum). Describe it. 



Conclusions. 1. What portions of the body appear to be 

 the most sensitive ? 



2. Can you suggest any reasons for the differences between 

 a frog's eyes and those of a fish ? 



3. What do you decide is a frog's range of vision ? 



4. Why does a frog need sense organs ? 



d. Adaptations for Respiration 



Observations. 1. Watch carefully for any movements of 

 the throat, nostrils, and sides of the body. What do you see ? 



2. Does the frog open its mouth while breathing ? Do the 

 nostrils open and close ? If so, is there a throat movement at 

 the same time ? 



Conclusions. 1. Does the throat movement that takes 

 place when the nostrils close increase or decrease the size of 

 the mouth cavity ? Where, then, must the air be forced ? 



