There are a lot of birds shit now at the BH and I only focus on those Magenta Red circles which have more birds shits. These are the area that have highest changes that the birds will make their first white gold.
This is my experimental BH with good tweeters and good design (my opinion). I tried to make as much observation as possible from this BH. From the picture above, it seem like the birds prefer the front side and right side of BH. The only explanation that I have is those area are darker than the rest of the area.
"New Bird Like Darker Area at the New BH".
If you have any other good explanation, feel free to write down your comments.