 How do you deal with crossover observations? So for example, I live out by Pothole State Park in the Columbia Basin. Lots of quail out here, good numbers of pheasant, even the occasional gray partridge. But let's say I'm going to participate in this bird survey blitz, and my friend a mile down the road is going to do the same thing. We're going to see some of the same birds. Isn't that going to taint the data? Yeah, so error like that is inevitable.