Hog Guards

The Hog Guards is a pig which can use a force field to block a bird temporarily. The force field can only block the bird for a few seconds, and the bird will retain their momentum, but will change their direction. The pig appears in Angry Birds: Bubbles.

Strategy
The easiest way to defeat these pigs is to knock buildings on him, as the buildings keep the same acceleration if falling, so it will instantly kill the pig.