I've had alot of views over the last two days from an Unknown source. What does this mean? The main photo being viewed has been featured on the BBC nature page, but i can see the hits that have come from there and they only account for a tiny percentage of the total views. So what does this unknown source mean? I've done a Google image search and the photo doesn't seem to be posted anywhere else, so i'm stumped 
Not that i'm complaining, just curious really!

Not that i'm complaining, just curious really!