From Bulbapedia, the community-driven Pokémon encyclopedia.
Articuno takes the form of a large bird with predominantly blue plumage. Its coloring is darkest on its long streamer-like tail and head crest. Its head crest is fairly simple, consisting of three rhombus-shaped feathers on its forehead. Its body is a sky-blue, growing lighter on its chest and belly. Its most distinctive feature is its large wings, which look like they are made of ice. It has a small gray
-beak and similiarly colored, thin legs. An Articuno in flight is a magnificent sight to behold.
Articuno is a genderless species.