Grass Seed Head

Taken in my garden. I've no idea what type of grass this is, but as it was underneath where we hang the bird feeders, I suspect it's come from one of them. I used flash to make the dark background (assisted by a bit of post-processing).

Please view large on black. Thanks for looking.

Edit: Thank you to neira-Dan for the ID. The grass is from the Setaria family (commonly known as Bristle grass).