Throughout the Angry Birds series, the Pigs set up blocks, usually created for fortresses. The Pig King orders his pig army to create fortresses using these blocks to delay the Birds goal to retake their stolen eggs.
Here is a table for how strong, easily destroyed by, and color of the blocks.
|Block||Strength||Color||Birds that can destroy it||Birds that can not easily destroy it|
|Glass||Weak||Light blue||Red, The Blues, Chuck, Bomb, Matilda, Al, Terence, Bubbles, Stella (via ability), Mighty, Mighty Dragon||Stella (herself)|
|Wood||Medium||Light brown||Red, Chuck, Bomb, Matilda, Al, Terence, Bubbles, Mighty, Mighty Dragon||The Blues, Stella|
|Stone||Strong||Gray||Red, The Blues, Chuck, Al (could almost destroy stones), Stella|
The stone, wood and glass blocks are what protect the pigs from being killed. When the birds try they will make a dent or can break a block. Some birds such as Red and The Blues will not do much damage on blocks. However, The Blues can destroy glass pretty readily if aimed properly.
|Angry Birds||Glass • Wood • Stone • Grey Blocks|
|Angry Birds Seasons||Gold • Clouds • Snow • Ghost Blocks|
|Angry Birds Rio||Sand • Iron|