Had a house with a lit path along the wall. Bats roosted in the roof directly above it. Some of them would beat up and down the path, taking the moths and other insects drawn to the lights. There was so much food that the same run, out and back, accommodated several at once. We had the laziest, and probably the fattest, bats in Cambridgeshire ! But it did illustrate the principle on which the bats operated, of chosing one route and using it repeatedly, thereby providing for the individuals without the whole colony competing for the one source.