Try going back over areas you have recently passed through. I find many times creatures spawn a lot in areas I recently occupied. A players presence will initiate creature spawning.
A lot of times I will stop, pan my camera over areas I have just travelled through, seeing deathsquitos & fulings that I know were not there a few seconds ago as I passed through. Today I came upon a Fuling garrison. I circled around it to avoid the berserkers, to start clearing out as many fulings as I could before dealing with the big guys. I then went back to the side of the camp where I made my original approach and there were now 3 lox there that were not there before.