 You're like, that is what we do. That's what we do, yeah. And so based on those isotopic ratios, they were able to determine that the highest likelihood that the butterfly actually didn't just come from West Africa. It was actually born in Western Europe. Wow. And it flew from Western Europe probably another 2,000 miles just to get to sub-Saharan Africa. Now, how do we know the butterfly went to sub-Saharan Africa?