Peas- leaves being eaten Help!

I've noticed today that most of the leaves on my peas have been eaten how can I stop this. The pes pods ar OK but the leaves are like nets

 

Have you got pigeons popping in for an early morning breakfast, eden?
I had many years battling the devil sky rats,hated using netting, but it did the trick.

 

I have covered with a net and I do not think I've see any pigeons around this area, any other suggestions?