Dear Elderly Lady and Yapping Dog,
The man on the bike, in the helmet and bike glasses, who skidded to a stop in front of your bungalow, alarming you, seeming to stare at length through your front window, was not in fact staring through your front window. You could not tell, but he was actually staring above your house at a bird in a tree, a bird he had never seen before. It was one of these.
The Eurasian collared-dove is described as being "strongly dispersive." It has dispersed its way from Central Asia through mainland Europe to the UK. It appeared in the Bahamas in 1980 or so, and from there hopped to Florida. Becoming established in that state, it dispersed throughout North America and first appeared in BC in about 2005. It since has crossed the strait to Vancouver Island, and has spread north.
I hope this explains things.