Originally Posted by
ThistleChaser
My theory on it is that there are three totally independent pools: Bore, Burrow, and "native". If you're on a rental bird, you'd only get the native stuff. Each of the three pools can be dug from or filled with no affect at all on the other two pools.
That's why, if you're just starting out digging, it's best to have a Bore/Burrow bird (say that three times fast), that way you'll pull up the most items -- your goal is to skill up, not make money. However, in my opinion, a more experienced digger would not want Burrow because it brings in lower quality stuff.