Nomadic peoples wander from one region to another in search of pasture land for their herds. Crows, unusally intelligent birds, make interesting pets. But farmers consider wild crows pests, since they are often destructive in their constant quest for food.
Crows help farmers, however, by eating enormous quantities of insects.
They also help to keep highways clean, for they eat not only animals killed by automobiles, but also the litter thrown out by travellers. I am a poor chess player. When it is my move, I look and see that the play I am thinking of exposes me to difficulties. Many citizens of other nations deposit their money in banks in Switzerland. The Swiss banks carefully protect the identities of their depositors, a matter of some importance to certain depositors.