Ok, this is not about the quality of this shot cuz it's a 100% crop shot with a 70-300 mm @300mm, the weakest focal length of that lens, from pretty far away. Anyhow, I was going through the files and saw this one after I zoomed in 100%.

See that highlighted black spot in front of the swallow?


Click image for larger version.  Name: Before meal time.jpg  Views: 76  Size: 190.5 KB  ID: 56314


I'm guessing it was a bug that this swallow was about to...swallow.

What do you think?