No creatures on the land caves

So recently I started caving in my single player world and my first was the lower south cave. But when I went in there, there was no dinos whatsoever. So I went to the central cave and the only dinos there were regular not cave varienys of the dinos, all under 150. But the cavern of the lost had the regular cave dino spawns. I've already used the destroy wild dinos command. Anyone else have any tips?