Something seems to be eating the tops off our french beans.

We do have some problems with rabbits - but they seem more interested in the
flowering plants in the nursery and tend to leave our veg alone. We also
have a number of magpies and jackdaws around - not to mention a couple of
wood pigeons who ate all our pea seed. We have strung CD's around but
someone told us that only works for a couple of weeks then the birds get
wise to them.

Any ideas on who the culprit may be and how can we overcome the problem

Jeanne