I recently read about the impossible mass transportation of livestock in Truth Proof by Paul Sinclair (not sure which volume, but I've only gotten as far as Volume 3) - sheep IIRC, being found crammed into an impossibly small pen. I'll see if I can dig it out.
Found it! In Truth-Proof 3, location 978 on Kindle:
While we were talking John remembered something else that had happened earlier in the year, and it was something that still puzzled him. By this point we had left the farmhouse and were talking outside, as John began telling me an amazing story - one that I believe is just as incredible as any of the strangest accounts in the world - including the paranormal happenings at the world-famous Skin Walker ranch in Utah.
John was showing me around the yard and we began walking towards a pile of galvanised panels, which are designed to be erected and dismantled fast. They are used to make corralled areas so the sheep can be managed more easily. He told me the panels can be combined to form a narrow passage with an upward sliding gate attached at each end. This panelled passage usually holds up to six sheep, nose to tail. The animals can then be tagged or moved through a foot bath if required, then released into a larger holding area.
John:
“Last year something happened on those fields Paul; something so strange that I still cannot get the image of it out of my mind.”
He began assembling a few of the panels as he spoke.
John:
“I fixed these panels together myself, because I needed to tend to the flock. It's a 'right game' trying to heard them into it because they know what you're doing. They're not daft. They know that going into that holding area involves something being done to them and they don't like it. That's why it's so hard to believe what happened. If someone had told me I would not have believed them, but I saw it with my own eyes.”
Paul:
“Saw what John?”
John lifted of one of the steel panels and asked me to hold it, he then lifted another two panels and slotted steel rods into them to hold them together. It took us less than 5 minutes to build this narrow run that forms a corral designed to hold six sheep, nose to tail.
John:
“Right, now you can see what I am talking about. Now imagine walking towards this and finding it full of sheep. Its hard to believe, but that run had thirty sheep crammed inside it one morning last year. The poor things were in a right state. They were piled up on top of each other, and in a right tangled mess. I dismantled the panels and began sorting them out, they were frightened to death. When I finally got them all untangled, four of them were dead. I think they must have suffocated or overheated. It must have been terrible for them.
I will never understand how they got in there in the first place. It's hard enough for me and the dogs to get them into the larger holding area in daylight, but this happened during the night. How thirty sheep ended up in that narrow steel passage I will never know.”