"It cannot fly because its wings are not yet fully grown. If your eyes meet with this Pokémon’s eyes, it will stare back intently at you. But if you move even slightly, it will hop away to safety."
Natu is a very interesting Bird-type Pokemon for two reasons. One, as the Pokedex notes, it can't fly. But that hasn't stopped it from knowing certain Bird-type attacks. Two, and arguably most importantly, it's a Psychic-type Pokemon, which makes it very different from its bird brethren.
Its Basic Attacks are Peck and Quick Attack, while its Special Attacks are Night Shade, Drill Peck and Psyshock.