A young college student had stayed up all night studying
for his zoology test the next day. As he entered the
classroom, he saw ten stands with ten birds on them, with a
sack over each bird and only the legs showing. He sat right
on the front row, because he wanted to do the best job
possible.

The professor announced that the test would be to look at
each of the birds' legs and give the common name, habitat,
genus, species, etc. The student looked at each of the
birds' legs. They all looked the same to him. He began to
get upset. He had stayed up all night studying and now had
to identify birds by their legs. The more he thought about
it the madder he got.

Finally, he could stand it no longer.

He went up to the professor's desk and said, "What a
stupid test! How could anyone tell the difference between
birds by looking at their legs?" With that the student
threw his test on the professor's desk and walked to the
door.

The professor was surprised. The class was so big that he
didn't know every student's name, so as the student reached
the door the professor called, "Mister, what's your name!"

The enraged student pulled up his pants legs and said...

"You guess, buddy! You guess!"