A malevolent, interdimensional race first encountered by the Borg and the USS Voyager in 2373. They are telepathic in nature, from fluidic space, capable of destroying cubes, and use organic biomass ships (both the Species and their ships are made of the same material). They are regenerative but are vulnerable to the modified Borg nanoprobe. Their ideology is The Weak Will Perish (which I think should be The Weak Shall Perish, but regardless). Captain Janeway gave the Borg information on how to defeat the Species (in 2373) in return for undisturbed passage through Borg territory.