So, I thought it was time to update this thread.
I am down to one persistent Crow ... I can hear them in the neighbourhood but only one is game enough to venture into our back yard.
Apparently, crazy lady with large water pistol in one hand and broom or garden hoe in the other is far more effective than CD's. Also, being picked on by smaller birds in the trees does not appear to be their cup of tea either
As free range is always supervised, I am able to keep an eye on this one determined evil black butted b*^%$d and as soon as he realises I have spotted him, he takes off
I was watering the garden yesterday and looked up into the mango tree to see him looking down at me; I pointed the hose in his general direction and he scampered across the branches to the edge of the tree and flew off.
I may just have won the war with the only casualties being a couple of eggs