A place of life or of death? Of a successful hatching or of predation?
I hope the former.
I don't know what bird's egg it is, I'm sad to say. Was never very good at identifying eggs. My dad knew and once had a collection. Somewhere, I don't know where, I think we have a Victorian cabinet of eggs with labels saying what they are.
Its whereabouts as mysterious as the egg I saw itself. And ours is not a big house.