I dunno but it made me jump that's for sure.
Commuting this morning, having just descended from "The Fox on the Hill" pub near Herne Hill, a pigeon flew out from a bus shelter right across my face.
I emitted a rather strange noise, sort of a sqwark which was slightly muffled, as it brushed across my nose.
Luckily it was flying across my path, so just my nose brushing / bouncing off the feathered flank. A somewhat perculiar sensation. It was a bit lardy as well so quite soft, this may also explain why it wasn't quick enough to get past before I arrived.
Be careful out there folks we are now under attack from urban wildlife as well as the traffic on our commutes.