On me way back from the English Market shop to the Marina on Monday, there was a sparrowhawk doing the rounds over the Customs House and environs.
I didn't take the photo, I hasten to point out.

She (I think) was scaring the bejasus out of all the other air traffic that had a beating heart, and doubtless giving the docks' rats and mice a severe fright too.
Geoffrey Hill's Genesis has some scary birds in it. Another blogger was lucky enough to hear the scary old bird himself recently.

If you're wondering about the beer, it's coming right up after the break.