Z-Serpents are amphibious lifeforms, native to Zoness that once lived a peacefully on the tropical vacation world. However, Andross's bio-weaponry had polluted the once beautiful oceans and transformed the beautiful sea creatures into hideous monstrosities and each mindless bio-tech drone has been conditioned to think only one thought, destroy Star Fox or be destroyed. Despite this, however, they were considered a failure due to not becoming as aggressive from the pollution as Andross had hoped.