The Fox Busters (paperback) Dick King-Smith
The farmer at Foxearth Farm is too lazy to build fences to protect his chickens from nearby foxes. It should be fox heaven: helpless, delicious chickens just waiting to be caught!
But years of "survival of the fittest" means that Foxearth chickens can think, run, and fly. So the youngest and smartest foxes get to work on a secret weapon. It's chicken-proof. In the meantime, three extraordinary chicks hatch at Foxearth Farm -- the Fox Busters!
Can chickens outfox a fox? It may be as easy as laying an egg!