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Noctowl bears similarity to an owl with brown plumage and has a darker brown triangle pattern of feathers running down its chest. Its wings and wedge-shaped tail are dark brown, while the undersides of its wings are light brown. It has bushy, cream-colored feather 'horns' that look similar to a trident or eyebrows. The ring pattern around its eyes and its talons are cream colored, and Noctowl's beak and talons are light pink. Additionally, Noctowl has large, red eyes. As shown in the anime, Noctowl can grow a small beard in its elderly stages.
Noctowl is a nocturnal Pokémon. It has exceptional hearing and eyesight, can fly silently, and can turn its heads at a 180° angle to increase its intellect. Noctowl is most commonly found nesting in trees and forests.