Goblins & Kobolds
The Gnolls are clearly a broken race. Both physically and emotionally. Their numbers are decimated with little chance of recovering, and they know this.
The Gnolls, while already savage and wild by nature, have mostly degraded into small packs of pathetic wondering strays. They try to ferociously survive anyway they can for there is no guarantee their small packs will live to see the next sunrise.
The few surviving Gnoll strongholds or large underground cavern encampments try their best to remain hidden, while still stealthily acquiring the slaves they need to keep their communities functioning.