Pigeon damage

For the first time ever my brassicas have suffered pigeon damage. I caught the plump, feathered s**s in the act of breakfasting on my spring cabbages and cauliflowers. They don't seem to like the cavolo nero, curly kale or the purple sprouting broccoli.

I suspect that they have moved into our gardens because the massive sycamore trees further down the street, where they used to sit and feed, have now gone. 

The cabbages and cauliflowers have now been netted over.