Where's my lunch?

If I sit and eat my lunch in the park, this blackbird comes to join me, announcing her arrival with a series of short chirrups. Today we ate a veggie sausage roll, then she hopped into the hollyhocks. I know I'm not supposed to feed the bird in the park, but after a year of sharing lunches (weather, work lunches and chores permitting), I think it would be rude not to hand over a wee bit of pastry or bread!