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Articuno is far more tame than the other legendary birds. This is because the three of them aren't actually too closely related - while Zapdos and Moltres share a common ancestor with the notoriously temperamental Fearow, Articuno is most genetically similar to the calm and even-tempered Pidgeot.
Articuno avoid areas with lots of people or Pokemon, and instead opt to live in cold, mountainous areas far away from human development. The telltale sign that you are close to an Articuno's territory is their song, a hollow, flute-like melody intended to be sung as a duet between the male and female during mating season.
In order to protect their eggs from predation, Articuno will migrate every two years to the Arctic circle to gather en masse for mating season. The males with the most striking casque, plumage, and song are the most popular with females, while males just want a female that can sing with them. Articuno pairs mate for life, with first-time couples composing their own song together to find each other easily during future mating seasons.
At the end of the week-long mating season, they will breed and produce a single egg, which the parents will take turns incubating. The parent that doesn't incubate an egg that season will fly back to their home territory (or trainer), while the Articuno that does will bring their egg to a communal nest closely guarded by the remaining males. The females will then spend the rest of the 60-day incubation period incubating their eggs, while the males rotate between hunting for food for themselves and the females and guarding the nest until the eggs hatch.
Baby Articuno are capable of flying and fending for themselves from birth, and soon after they begin to hatch, the adults will collectively depart back to their home territories. The juveniles will flock and hunt together, feeding on Remoraid and Snorunt, until they reach puberty, at which point they will all go their separate ways and search for a mountain to call home.
