Some of my neighbours comercial lambs were put in another neighbours field for grazing about half a mile away. They were there for a month and then someone left a gate open into another field which wasnt secure so they left. Through the new field, across a neighbours land, through the garden and down the drive, along the road, through another field and back to their home farm. It was two days before anyone even noticed.
I dont find them stupid at all, quite the reverse but the more timid breeds are more inclined to blind panic and no one is sensible when they are fleeing in terror. But then I have had years of training animals from horses to rabbits so this idea of "seek first to understand and then be understood" comes naturally. All my animals get trained as I would a dog with commands, body language, tone of voice and hand signals. I didn't really notice that I did this until OH and I both lost our voice earlier in the year and managed to get the sheep and lambs moved about and sorted out each day with a mixture of waving, clapping and pointing.
I used to think chickens were stupid as the ones I had met on livery yards seemed to be. But when I kept my own I learnt to understand them and communicate with them. I became such a convert I published a book.
I am currently seeking to understand ( and socialise ) 6 Norfolk Bronze turkey poults. They are soooo different from brooding chicks, it's fascinating!