Treecko is a small, green, bipedal reptilian Pokémon. It has yellow eyes with long, narrow pupils. Treecko's hands and feet each have three digits covered with tiny spikes. These spikes allow it to scale vertical walls with ease. Its stomach and throat are red. It also has a line across on its stomach resembling a pouch. Treecko has a large, dark green tail with two separate lobes that it uses to sense humidity. This ability allows it to predict the next day's weather.