A hard but necessary thing to do
Despite my horror at the thought, my only choice was to figure out the best way to put it out of its misery.
I used the first heavy thing I saw: a brick in the garden that I had done mosaic artwork on years ago. I put the bird on the earth, closed my eyes and dropped the brick as hard as I could. When I opened my eyes and removed the brick to look, it was still alive ... the head was jerking and twisting as it gasped. I blocked my ears (instinctive reaction to looking at horror). I then quickly took the brick and slammed it with greater force onto the bird. I dug a hole there and buried it, placing one of the few remaining mosaic tiles (which had fallen off with the impact) as its tiny headstone.
I guess the message for today is: If you have to do something, no matter how difficult it seems or feels, just close your eyes, block your ears and get it done.
Or maybe open your eyes, open your ears and do it.