Tomatoes and the birds

I grow a few toms outdoors and have found, for the first year ever, that birds have taken to pecking at the ripening fruit.  I have a feeling it's a female blackbird, as I've seen it scurrying about under the plants. I hope she's not teaching the skill to any others. One pecked  fruit was in the GH.   I've taken measures to shield the door there but am at a loss what to do about outdoor plants.  Any experience of this anyone?

My poor tomatoes