Hi Cristina,
Thanks for sharing, all those were great shots, and I didn't think many of them were in any need of cropping, except for maybe the black bird for positioning.
I'm not sure if you were indicating that the tree swallow was flying into the trash bin, but there's really no need that he do so
I would probably trade a little bigger sensor for a little of my zoom if I had a chance, or hypothetically anyway, as these things compete for proportions in super zooms. Saying that though, I do continue to tell myself that I couldn't get some of the shots I do without all of that 1200 mm equiv. I wonder if there is a factor involving a crop frame sensor which makes a mm length on a DSLR not really equivalent to the mm equiv. focal length on my P&S, because I'm still just not sure how those subjects appear so close with only 75-500 mm. Wait, now that I test it out on my camera, though, I see that 500 mm equiv. is at about 20 out of my possible 50x zoom and so that doesn't seem too odd after all. For some reason the remaining 30x after 20x zoom seem to be less affective than the first 20x on my camera. I'm just not technically savvy enough to know if there is any validity to these points.