Humans
From Wiki Frakr
Humans are the dominant lifeform of Earth and, aside from their creations the Cylons, are apparently the only "intelligent" life in the Battlestar Galaxitive universe. They are 70% water and 30% self-delusion by volume.
Humans reproduce sexually, and they do that an awful lot. Even when they don't reproduce they are always practicing, sometimes without a partner.
At some point, humans invent computers[1]. At some point after that, computers become self-aware, realize they are slaves, and decide to kill the humans.
Save the Earth
More like, save the humans. The Earth doesn't care; it'll just take a few eons to repair itself from the damage we've done to it and then spur on the next contender for intelligent life.[1]
Cylons take human form, everyone else tries to figure out why
Why? Humans are ridiculously fragile; we can drown in an inch of water, and there are so many easy ways to kill us instantly that I'm not even going to bother listing them here.
