Meet Spike
You are quite correct in your comment. The dark object is a drainpipe from the roof which offers cover for the nest. As explained the camera angle of view is slightly restricted to say the least

I quickly downloaded the image to my ipad and posted from there. I will do a crop, removing the offending drainpipe.
I find the "residents" quite amusing and it is interesting to see them develop at relatively short range .
Kind regards
Eugene
drobbia
9 yearsMember
California, USA
"It's not what you look at that's important, it's what you see" - Thoreau