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The Boomerang Bird (sometimes referred to as Green Birds, Parabeak, and Ducans) are a species of birds used in Angry Birds, starting from Theme 6-5 (part of the episode Danger Above). These birds are shown to be in captivity, as a single Boomerang bird is enslaved inside a cage in Theme 6-4 by four Pigs. With the help of some birds, the Boomerang birds spins around and escapes captivity of the pigs. Later, in The Big Setup, the Boomerang birds are re-captured alongside the other birds, but they soon break out thanks to the efforts of a Big Brother Bird. Once again, the Boomerang birds help their fellow birds escape capture.

The Boomerang Birds' main ability is to swap directions in mid air. When the screen is tapped or clicked by the mouse, the Boomerang Bird will open its large beak and proceed to head opposite the direction they are headed and strike areas that the other birds can't reach. Besides this, the Boomerang Birds are fired much differently than the other species. When they launch, they're constantly spinning, and they're launched at a farther distance. The boomerang bird is based upon the Emerald Toucanet.

Advantages and Disadvantages
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The Boomerang Bird is very good against wood and glass, but not great against stone. When its ability is used, it's often the longer (eventually a set time) the bird can break through entire columns of wood and glass.

A common disadvantage is when the bird is fired straight into the air, it's hard to arc it perfectly when it approaches the ground. Sometimes it can hit the ground and become a corpse.

Trivia

 * Boomerang Birds are stylized after toucans and hornbills.
 * A strategy to do incredible damage upon firing this bird is to fire backwards and quickly tap the screen or click the mouse.
 * In Angry Birds Rio, they only appear in 11-10.
 * Strangely, even though Boomerang Birds have green feathers, orange ones appear when they disintegrate after becoming a corpse.
 * The Boomerang Birds will make the Yellow Bird's pain noises when being a corpse, thus making it the only one without an original pain noise.
 * Boomerang Bird is also the only bird that rotates while flying from the slingshot.
 * Boomerang Bird, along with all of the Angry Birds (except the Big Brother Bird) debuts in a short cartoon of Angry Birds: Summer Pignic Surprise Video.
 * In the Angry Birds Seasons Ham'o'ween update, Green Bird has a new tone of voice.
 * The Boomerang bird is the only Bird that is shown in the level before is played In as a Unplayable item, and it does this twice.
 * Even if it has a toucan-like beak, it still can roll just like Yellow Bird's glitch.