What do animals do when they are scared?

Today Westley and I talked about what different animals do when they are scared... when they think something is going to eat them.
I first reminded him of how the rollie pollies roll up into a ball.
We listed out other things animals do when they are scared, and Westley acted them out

hiding in his "shell"

 rolled up like a rollie pollie

Others:
Bugs/Birds- Fly away
Deers and others - freeze
Cats- scratch, hiss, run away
Dogs- bark, fur on their backs go up
Skunk- sprays
etc.