Feather ID (again)

Dear all,

I have yet another unidentified feather. It is black but has dark grey, almost light-black streaks across it. I thought it was a crow or rook or jackdaw, but then I noticed these streaks, could anybody tell me what bird my feather came from. There is also a feather which I think came from a mallard, but I don't know which sex, female or male? If I am wrong and it isn't a mallard, please could someone correct.

Thank you,

Mark Hi