Whooper swans killed by overhead wires

Louse Muir of the RSPB on Islay is seen with one of two young Whooper swans that were killed yesterday following collisions with overhead wires on Sunderland Farm.  Power companies have installed high visibility discs on their cables in some areas that are particularly susceptible.  On Islay, that should probably mean eveywhere that cables cross open fields. 
Reducing the number of collisions ought to make commercial, as well as ethical, sense because wires are quite often brought down.  This can cause significant power outages which are of course, very expensive to fix.
Carl