I'm just a bouncing and bobbling alligator!
Just hang me from your desk lamp or any other convenient place and I will bobble and bounce every time you touch me.
And check out my lower jaw action... it's almost kinda creepy the way it moves. My jaw, like my arms, legs, and tail, is attached by a spring that wiggles and wobbles.
Size: I'm just over 4" and my hook & spring are 9" B.S. (that's Before Stretching... in case you were wondering)