AScientistAndFrog Joke

A committed scientist decides to research on animals. He goes to a kennel but is not particularly appealed by either dog nor cat.
Then, he goes to a pet store. Having bad memory of the lab rats and other gerbils, he chooses a nice little frog which seems perfect for the kind of tests he wants to perform.

The first day, he puts the frog down and says : Jump. The frog jumps. The scientist measures the leap. He writes in his notebook : 4 legs, 73cm.

The second day, he cuts two legs off the frog, puts it down again and says: Jump.
The frog manages to leap a meager 45cm. The scientist writes down: 2 legs, 45cm.

The third day, the scientist cuts the 2 remaining legs. He puts the frog down and says : Jump.
But the frog does not move.

The scientist writes down: no legs. Deaf.