I was disappointed to hear recently that it is a myth that you can carry two tons of canaries in a one ton van by banging on the sides to keep half of them flying around. Apparently it won’t work because the van is a ‘sealed system’. So what about a van with mesh sides, would it work then? Or one mesh side. Or just a panel of mesh somewhere. Don’t get me wrong, I have no intention of carrying out this experiment. I don’t have a van. Or enough canaries.
(Yes, I know they are pigeons in the photo, not canaries. Could this be how the myth started?)