Triggering moving limbs

gribble

If I have a character that want to walk along with legs and arms animated, how would I do this?
Do the limbs all individually need behaviours attached to them?
How can I make sure they stay 'attached' to the body?

Hapiapps

Normally, they animation is just a series of images in png format of the whole body frame by frame. Not each separate body part since there are no joints yet in GS.