Natu is a tiny, mostly green bird Pokémon with a nearly spherical body, and accents of red, yellow and black. It possesses brightly colored, yellow-and-red wings with thick black stripes. The wings are small and not fully-grown, thus making it unable to fly. However, it can hop and climb tree trunks. Natu has a red crest on the top of its head, and its three-toed feet and three tail feathers are red as well. Natu also has almond-shaped eyes and a yellow beak.
Natu is believed to be native to South America, although it can be found near ruins and in forests in other areas of the world. Natu usually forages for food on the ground. However, on rare occasions, it will hop onto branches to peck at the tree's new shoots. It also picks food from cactus plants, easily avoiding the buds and spines. Due to its prophetic abilities, Natu is a very cautious Pokémon that is easily spooked. It has the quirky behavior of staring at something until the thing moves.
Crystal owns a Natu which she first appeared in Slugging It Out With Slugma, whose Psychic attacks allow her to hold her own despite her size. Crystal also uses Natu to provide flight transport over short distances. In Lively Larvitar, the origin of Crystal's Natu is revealed: she, along with Crystal's Parasect, Hitmonchan, and Cubone, were wild Pokémon living in Mt. Mortar and had fought with a local Arcanine that had gone berserk from a severe eye injury. after the ordeal, Natu used her telepathy to detect if enemies were in the area. Sometime between the Gold, Silver & Crystal chapter and Emerald chapter arcs, she evolved into a Xatu, and with her came increased speed and flight stamina, though she isn't seen battling much.
In The Escape, Will is seen to have a Natu during Silver's flashback of his escape from the Masked Man, probably a pre-evolution of the Xatu he used many volumes earlier.