All three of the Blues are completely identical. They have longer beaks than Red, red-orange bags under their eyes, and unlike most other birds they have no eyebrows. They have two blue crest feathers and two black tail feathers. Additionally, unlike the other birds, they have no chest feathers.
However, in "Angry Birds and Mighty Eagle," and "Summer Pignic," The Blues are shown to have a different appearance. The feathers underneath their beak are now lighter, to make them appear to have chest feathers. They have big, thick eyebrows like Red, they have 3 head feathers instead of 2, and their tail feathers are blue, and more detailed than being black. Their bags are still there, however.
In The Angry Birds Movie, the Blues are small anthropomorphic birds with small yellow legs, and they have different eye colors. Jay's eyes are blue, Jake's eyes are green, and Jim's eyes are brown.
Jim, Jake, and Jay were born in a baby blue egg after the battle with the pigs, with Red nearly sacrificing his own life in saving the triplets' lives. Shortly after this, the newborns went to the newly repaired slingshot and launched themselves to sea. The Blues are very mischievous birds, often getting into trouble for pranks at the other birds. They have a very close bond with each other, almost always be seen together.
They can be very intelligent and cunning, and use this feature to get out of situations they find themselves in. They are extremely gifted in constructing contraptions, though this talent usually goes to fooling the pigs or the other members of the flock. They can be friendly and loved by the other birds. They are also good at figuring out situations.
Because of Jay being well brainy and confident and the oldest sibling, he instructs and gives out plans for the other Blues, as he comes up with the pranks, and likes having fun without being worried.
Jim is very helpful and kind-hearted towards the flock and like Jay and Jake, he sometimes follows Red's orders. He is shown to be very energetic and a bit foolish. Jim can occasionally be a little timid, but he always keeps his cool.
The Blues' splitting ability can be exploited in different ways. By splitting just before impact with an obstacle, the three birds' force on impact is concentrated for maximum force. Alternately, the birds can be split early allowing them to spread out and hit more obstacles at once.
While the Blues do not cause much damage with most obstacles, they do have a unique strength against glass/ice, able to penetrate it with surprising ease. They also can damage or destroy damaged shards of wood. However, they cannot destroy stone at all.
By passing through an extraterrestrial wormhole of some kind, The Blues can transform into The Lightning Birds.[4] In this state, The Blues have some different body features, the most notable of which is their helmet. However, most of their abilities remain the same. This transformation only appeared in Angry Birds Space.
Red is seen as a father-figure to The Blues, however stricter than Bomb. He places them over the egg's safety, and trusts them to do so, exampled in the Toons episode Dopeys on a Rope. In Slingshot 101, Red is very concerned for them after being flung into a mountain, afraid that they will be defeated by the pigs. However, in the end they are seen playing with each other.
In the film version, Red actually protects the Blue Egg during the confrontation against Leonard. As Leonard was lost in the explosion, Red managed to survive as the Blue Egg that he carries has already hatched and to see the Blues who belonged to Greg Blue and Olive Blue as he returned the triplets back to them. To thank Red for saving them, Jay, Jake and Jim made a choir with the other hatchlings on the island to sing a song about him.
Chuck and Jay, Jake, and Jim are considerably good friends. However, sometimes The Blues are annoyed by Chuck's nonsense, just like the other birds. The Blues are stubborn towards Chuck when he made them go through his obstacle course in the toons episode Full Metal Chuck. In the Toons episode The Bird Who Cried Pig, Chuck is welcomed by the Blues and they say, "hi" to him. (assumption because they don't speak in the toons episodes)
Bomb acts as a more tolerant father-figure to The Blues, exampled in the episode Shrub It In where Bomb is playing with them. Bomb also is seen playing with them in the toons episode The Bird Who Cried Pig. They also happen to call Bomb "Uncle Bomb" in the Angry Birds Mini-Comics #1. It is also said on the Angry Birds Official Website that The Blues prefer Bomb over Red due to Bomb's more likable personality.
The Blues see Matilda as a mother figure, as she constantly scolds them for doing wrong things, as exampled in the Toons episode Do As I Say!. The Blues don't like it when Matilda bosses them around and are usually scolded for the things that they do. The Blues also are very aware of her temper and care for her, as exampled in the Toons episode Shrub It In where they don't want to tell her about her rose bush to hurt her feelings.
Hal is seen as a better father-figure to the Blues, as they choose to tag along with him than Red, who offers to follow along. In a short strip from Angry Birds Comics Issue 4 titled "Peak Beak," Hal is willing to help them through many obstacles, like crossing a cliff, being shelter for rain, and being a boat to cross a river. It seems to be that the Blues stick to Hal more because his beak an extremely useful component of him.
It can be assumed Terence and The Blues are good friends. In their description on angrybirds.com, it is shown that they play pranks with him as some sort of prop, as it mentions they dressed up Chuck in a pig costume and called Terence over to deal with him.
The Blues treat Bubbles like a younger sibling. When The Blues barely knew him and he got captured by the pigs, they went out of their way to rescue him. They also don't seem to get very upset when he eats most of their candy, meaning they are more tolerant if he wrongs them in any way. The Blues also think he is cute and coo over him at the end of the Ham'o'ween Short Movie.
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