The Species basically appear to be bipedal (humanoid) forms. Unlike other aliens in the Species series, however, Patrick Ross has two types of alien forms: Mating form and combat form. Patrick's alien form for copulation is bipedal, humanoid, and male version of Eve's. While Patrick's alien form for combat (so-called 'Fighting Patrick') is quadrupedal, bigger, and more 'brutish' in appearance than Eve. His second stage appearance is also similar to the xenomorphs of the "Alien" films; both were designed with input from H. R. Giger.