As the name implied, Monoids were one-eyed creatures that unusually named themselves by a relative ranking number, rather than by any sort of unique name. An individual named "One" could easily find him or herself demoted to "Four" if their political fortunes were reversed. Only vaguely humanoid, they were initially a slave race to humans who fled the Earth following its alleged destruction. Over the course of the very long journey, they eventually overthrew their oppressors and reversed their political position entirely. This change in fortunes was largely the result of the fact that the First Doctor and his companions unwittingly interfered with the status quo on the Ark by introducing a cold virus to the ship's non-resitant human population.
The show's been on forever. Some species names are simply going to get reused. One of the most obvious are the Vogans. Most fans remember the Vogan from season 12's Revenge of the Cybermen. But there's also the Vogans that plagued the Third Doctor…
The top-level category for species is category:species. We know what you're thinking: "Why did we make it to difficult to figure out?" Well, the admin staff of this wiki delight in making things as hard to figure out as possible. .
If you like alien species that are based on Earth animals, you're in luck. All you have to do is go to the page of an Earth mammal and check out the "looks like" box. For instance, if you wanna know what aliens look like elephants, just go that pachyderm's page and find yourself a breadcrumb at the top of the page.
One of the cooler species categories is species by biology. Take a gander! That category will help you find species by the special biology they have. Aquatic species, energy beings, species with binary vascular systems — they're all here waiting for you.
Maybe no publication has been so active in the creation of off-the-wall species than Doctor Who Adventures. Some of the funkiest names in DWU history come from that mag. Both Homozillians and Hussuloofian come from DWA – and we've not even looked outside the hs.