The parent rooks fly obliquely up the hill past the back of our house and through a gap in the trees to some place across the road and behind the farm. There must be some amazing source of food there. I guess it may be fields with cattle in them. The rooks use a two direction route - low to the ground on the way out against the prevailing wind. They look like gangs of black rags flapping only a metre or so above the barley. On the way back they fly much higher, aided of course by the wind.
The only time they deviate from this path is when a red kite is about, then they all gang up to mob the kite, even though their babies are a mile away.
The birds in the garden are also very busy. Mr Blackbird nearly met his end today. He squared up to a magpie, who then started chasing him. Mr Blackbird, you are very brave but your babies need you too!