Thank you and I don't blame the crows, as seagulls are the real scavengers. I don't suppose that you have any Egyptian geese over there, as the males are big fighters, and they will even have a go at humans.
We used to feed a wild pair of the geese in our garden at a previous place and they got used to us. But every time that the female had babies and I came near them, the male goose would attack me !LOLZ