The blue bird is the second bird the player gains access to. This bird's ability is to split itself into three copies when the screen is tapped. However the blue bird is much smaller, it is much more capable of destroying more than 1 object easily. However it has a lower damage than most birds.
The blue bird is one of the first birds to appear in the game and is very common, the blue bird also appears in all 3 angry bird games, halloween, christmas, and original game, within all themes as well. It is also one of the only 3 birds that appears in the short angry birds movies, (mighty eagle) trailers, alongside, small red bird and yellow bird.