Once a long, long time ago I read the cool novel Startide Rising by David Brin. The Uplift saga that the novel is a part of is about a universe full of different species. The only common connection between all these species is that another species made them intelligent, except for humanity. Other species were gunning for humanity simply because they had no up-lifter.
I didn't read any of the novels after that, and I wonder who uplifted humanity in the saga, or if they weren't uplifted, what was humanity's origin?