 Now, it's actually not too bad because, you know, we all know houseflies can get very annoying if they're flying around your food. But these guys are just flying around in a circle away minding their own business. What are they doing? What are you at, guys? Well, they actually don't fly in circles. This is Jochen Zeil. He's Emeritus Professor in Ecological Science at the Australian National University. And like our last expert, David, he's based in Canberra.