This is what the oats look like when they are in the wind rows.  Its has just been cut so it is nice and fluffy but as it dries out the size will shrink by half.  The moisture will evaporate and the tasty seeds your rabbits, chinchillas, guinea pigs etc. love will still be there waiting to be baled.  The baler comes around and packs the hay into 100lbs bales that go to the barn to wait for someone to need it.  Horses, cows, llamas, donkeys, rabbits, chinchillas, guinea pigs along with lots of other animals love oat hay.  It is not the main diet it is more like a treat and a feel good snack for your pets.