Blocks

Here is a table for how strong, easily destroyed by, and color of the blocks. 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 the Red Bird and Blue Bird will not do much damage on blocks.

In Angry Birds Rio, here is their list of structures.

Wood

Cardboard

Crate

Walls

Metal armor Crates

Glass/Ice

Stone

TNT Crate

Rubber Ring

Grass

Vines

Beachball

Umbrella

Sandstone

Rock

Balloons

String

Feathers

Lights

Petrol

Wheels

Flammable liquid bottles