Zoid, Scavenger 1

 Scavenger: Zoid is the first in a brilliant sci-fi adventure series from the team behind The Edge Chronicles. A spaceship the size of a city is on its century-long journey to find a new Earth. When it launched it was populated by thousands of hopeful passengers and the most technologically advanced Zoids in the world, ready to serve the crew's every need. But the Zoids rebelled, wiping out most of the crew in one bloody uprising. Now humans are hunted by the Zoids like vermin. Fourteen-year-old York is a Scavenger - he hunts Zoids, bringing back their parts to mend the technology on which the few remaining humans rely. York has always battled to survive, but now the fate of his people is in his hands...