I've had these cameras up for several months now; I guess now that winter is over, the birds are more active and really have taken a shine to this particular dome camera--4th time this week.
There's no perch near the camera (not a downspout or anything), otherwise I'm sure they'd stick around if they could
Their process seems to be 1) perch on the deck 2) poo 3) hey, shiny object! 4) investigate 5) fly away
Exposure is set to 1/250 and the wings are still blurry but I don't really have an interest in changing the exposure to accommodate.
I had a male (I think) robin last year in the spring continually flying into my windows - like multiple times an hour. I think he saw his reflection and thought it was another male out to steal his females or something.
In the end I found him (dead) on one of my lower roofs.
This spring we have had a Robins hitting our windows. I read that, as Hoog23 says, protecting their territory. Only way to combat it is to make it not reflect, or when it starts, put the cat out front.