Can't Stop Laughing...

A college student needed a small two-hour course to fill his schedule 
and the only one available was wildlife Zoology. So he joined in and 
after one week of study, a test was held. The professor passed out 
a sheets of small paper where in each square was a carefully drawn 
picture of a bird's legs.
No bodies, no feet, just legs.
The test asked each student to identify the birds from their legs. 
Our student sat and stared at the test getting angrier every minute. 
Finally he stomped up to the front of the classroom and threw the 
test on the teacher's desk. "This is the worst test I have ever written."
The teacher looked up and said: "Young man, you have not filled in 
anything and you definitely have failed the test. 
Tell me, what's your name?"
The student pulled up his pant to the knee showing his legs and said,
"You tell me...?"