![[PokeCommunity.com] Uno, Dos, Tres. [PokeCommunity.com] Uno, Dos, Tres.](https://archives.bulbagarden.net/media/upload/2/20/Legendary_birds.png)
Shameless copypasta from Bulbapedia: https://bulbapedia.bulbagarden.net/wiki/Legendary_birds
Legendary birds is a collective term used to refer to the trio of Articuno, Zapdos, and Moltres. They are also known as the winged mirages (Japanese: まぼろしのつばさ phantom wings).
Being the first legendary trio, they set the standards for future trios; that is, they all share similar attributes and—in the case of most of the future trios—are considered equal among themselves. Like the other trios later would, the legendary birds share a master in Lugia (in the anime and some games, at least), as well as two common traits: their Flying-type and their Ability, Pressure. In the anime, Professor Oak states that Articuno and Moltres combined powers of ice and fire are the source and cradle of the oceans, and that Zapdos' electric energy creates the currents and streams, which is why the three ancient creatures are closely bound to the guardian of the ocean, Lugia.
Now about the thread title... Practically everybody knows this by now, but if you look at the names of the Legendary birds closely, they end with these words: Uno, dos, tres. In order.
Now the question is, which one is your favorite?