FOR WAGGONER’S BIOLOGY 
83 
likenesses do you observe? What differences? Watch it crawl ” 
on a smooth surface, such as glass, and then on a rough one. How 
does it “ crawl ”? Why did it have difficulty in the first case? 
Note the large mouth. Induce the snake to strike.” How does 
it do this? Note its forked tongue. Find out what you can of the 
food habits of this snake. What adaptations has it which fit it for 
its manner of food-getting? 
EXERCISE 81 (Supplementary) 
A BIRD • 
Procure a live pigeon or English sparrow and place it in a cage. 
Supplement this with a mounted specimen of the same bird if 
possible. 
What is the general form of the bird? How does its shape adapt 
it for flight? Note the body covering. What characteristics has 
such a covering which further fit the bird for flight? How are the 
wings adapted for flight? What is the shape of the head? How 
is it attached to the body? What is the advantage of a neck which 
moves as freely as that of the bird? Where are the eyes located? 
What are their size and shape? Note the eyelids. What is their 
nature? The ears are below and back of the eyes. Examine the 
beak. Determine which part of it is movable. Note the nostrils. 
What is their position? Draw the head. Where are the legs 
located with reference to the body as a whole? How are they 
adapted to the bird’s mode of life? Note the feet. How many 
toes are there? What is their position? Draw a foot. 
EXERCISE 82 (Supplementary) 
A MAMMAL 
For this study procure a live “ rabbit ” (hare) or a squirrel. 
Mounted specimens may be used if desired. (The rabbit and 
squirrel are rodents, or gnawing animals.) 
What are the size and color of the animal? What is the general 
