A big egg

I found this large egg in the driveway today. It seems that something recently hatched from it: you could still see the blood vessels attached to the inner membrane. It must have been a pretty big something, because this egg was easily as large as a hen's egg. It had brown speckles on it.

At first I thought it was an owl's egg, but they are white mostly, and so are hawks' eggs. But crows' eggs are speckled like this, so maybe that's what it is.