I'LL NAME THOSE FEET IN TWO

My wife walked into his ornithology class and found five birds with bags over their heads so only their feet showed. "What's this?" she asked.

"It's an exam," explained the professor. "Your job is to identify each bird by looking at its feet."

"What a stupid test," complained my good lady.

"What's your name?" demanded the angered professor.

The wife pulled up the legs of her jeans and answered, "You tell me."