Reptilian humanoids from the Gamma Quadrant who were genetically engineered by the Hunters to be prey in a ritual hunt.
The Tosk are a reptilian humanoid species from the Gamma Quadrant who were genetically engineered by the Hunters to serve as quarry in a ritual hunt. They are bred to be pursued, can camouflage themselves for short periods and need very little sleep.
In Captive Pursuit, a Tosk came through the Bajoran wormhole, becoming one of the first Gamma Quadrant visitors to Deep Space 9. Miles O'Brien befriended him, and when the Hunters arrived to reclaim their quarry, O'Brien helped the Tosk escape so that he could continue the hunt and die with honour, as he wished.