linking layers in after effects.

Using what I learnt in the aftereffects tutorial we had the other day I was able to put tother separated animation of different photoshop layers and run them together. In this scene a mud monster lands on the boys shoulder originally I just had him blinking his eyes but it look far too static and there was no weight to the monster. I decided to have the head and shoulder move to rectify this problem. The problem with moving the head was the animation for the eyes blinking was done using separate layer for each of the frames, moving the head would leave the eyes behind. By parenting the eye layers to the head layer it meant they would move at the same rate as the head so they'd always stay in the correct place.