I think he did it on purpose though, in the baling process you stop then wrap, otherwise there'd be hay on top of the wrap and that sucks.
This fox being right out at the very outside of the bale, between the wrap and the hay tells me it was rolled up right at the wrapping process.
So if I had to wager, the guy shot the fox, filled up the baler with hay until the full bale alert went off, paused the auto wrap, sucked up the fox in the baler, then hit the wrap button.