Rubber’s effect

Unity Engine
1

Hello!
We need rubber’s effect for this moving. It is necessary to fix duck to the floor. By clicking at the duck’s face and cursor’s moving the duck’s face should become stretched and jump, after that it should be restored to its original position. When ducks face moves, its body should not move.
How can we do it?

Example: http://rodrigopegorari.net/blog/?p=58

2

That’s pretty cool, I’d love to know how to too.

3

HI. I also want to know how it’s done.