The following birds have the listed special abilities.

Ability	How to unlock
Blues	Splits into three and passes through ice.
Bomb	Explodes upon request after a tap or after he lands in a certain area.
Chuck	Moves in a straight line that can remove wooden pieces.
Matilda	Tap to drop an egg bomb. After laying the egg, Matilda will get a flight boost.
Red	Can move strong stone blocks. Tap to have Red release a gust of energy that can break stone blocks.
Silver	Tap to start a loop that ends up downwards at the point where the loop started. She can take out blocks during the loops, and can reach out of place pigs hiding under blocks.
Terence	No special ability, but can that destroy anything in his way.