Stretching a net over them which is fixed to the ground with small wooden posts or tent pegs is ideal for this. There are many different types of nets available, but the mesh size should be very small so that sparrows or other small birds cannot get through or become trapped in the net. Another alternative is to use an old net curtain. The curtain has a small mesh size and therefore provides ideal protection against berry thieves. Nothing then stands in the way of a successful harvest.