In some missions, cannons will fire two missiles at a time.
Angry Birds Transformers
When underwater, you can only see their dorsal fins, but you can still shoot at them.
Depending on the player's Transformer and the difficulty of the level, it is possible to earn over coins in these types of levels by popping bigs, destroying fortresses and shooting at golden coin blocks.
Their attack is identifiable with by upgrading the Transformer itself gets near. It turns you into a washing machine the same as the normal missile if you get hit by one, shooting it gives you coins.