BeckyLa - sorry I don't have a picture, but mine are about 6' long by maybe 3.5' square. Yes, they fall apart into flakes just like small squares do -- from the supplier I get mine from, a flake is usually about 12 lbs but of course that varies depending on the hay and how the equipment is adjusted.
I have heard of a specially designed big square feeder for horses but never seen one-- although some people put 'em (whole, or in flakes) in roundbale feeders.
I just use 'em the same way as I would use small squares -- peel off however many flakes I need to feed (I weigh my hay out in a sling, each feeding, to make sure I'm not 'drifting' in one direction or the other) and chuck 'em in piles on clean snowy ground.
The main advantages (to me) of big squares is that a) the hay is somewhat cheaper per pound, and b) you can store more weight of hay in a smaller storage space than you could with small squares. You do obviously need a tractor with a bale spear to move 'em though -- but I get my hay from the guy down the road and he drives his tractor down and helps me get it into the barn. (Drops it onto a dolly in the barn doorway and then we roll it to where it's going and tip it off onto a pallet, just 1 layer of bales obviously)
2468Chickensrgr8, I have seen haynets and macrame tote bags made out of baler twine. Also it is excellent for temporary repairs around the place, tying things to the top of your car (synthetic baler twine knots well and yet the knots are very easy to undo, they don't jam), and general all-purpose twine type use. Natural (jute) baler twine, usually just from small squares, can be braided into cheap useful leadropes, or used in the garden.
Like you I have a certain amount of surplus sitting in the barn, but I actually use up a surprising amount of it each year
Pat