Okay great :D
Also, I would love to add this race to the list, but I'm not completely sure what category they would belong to. I would guess Urban Legends?
Race name: Sirens
History: Centuries ago, these half bird, half humanoid, creatures roamed the seas, luring men of the seas to their untimely deaths. They lived far from civilization, only showing their beautiful faces to those they are about to kill. Now however, they seem to have disappeared, the last reported member of their species having died 220 years ago.
Description: These creatures were said to be incredibly vain, with their places in the hiearchy being solely determined by their physical beauty, and the beauty of their singing voice. Under the light of the full moon their appearance changed drastically, showing rotting skin and crawling maggots. Strangely enough, those Sirens that looked the most beautiful normally were affected the worst by this apparent curse. Sirens were a completely female race, hating men to an almost unbelievable extend. A siren that fell in love with a man would be forever expelled from the sea, and might even be killed by their tribe.
Children: It is very rare for a child to be born in a Siren community, but it does happen. While Sirens are perfectly capable of giving birht to a child of a man, their prefered method of conceiving is laying an egg out of which a child will come. This child has no father, and is a 100% genetic copy of her mother.
Why they fit in this category: Not sure which category yet
Do they (as a whole) wish to reveal themselves: No. Sirens detested humans, and preferred to live as far from them as they could.