7 million dead birds seems like it would be easy to video/photograph. Choosing to forego documentation that supports these claims has to be intentional.
Please take some time to research your inner techniques of logic, and how you assume outcomes and motives (in general). You appear (to me) prone to jumping to definite conclusions based on faulty logic and/or incomplete data. Not an attack, just a comment.
I can't fault him. Incomplete data is what we have in the real world and while he has shown no evidence in this story a lot of what we read in the media is planted to either pander to their readers or from public relation firms.
I don't think it is a bad habit to assume that this has been planted for some reason. If not, 7 million birds should be enough that you can see them drop in droves. 7 million is a very, very high number.
As noted above, 7 million birds per year, spread across 84,000 towers is about 1 bird per tower every four days. That alone isn't exactly noticeable, and given that most towers are located in out-of-the-way areas, that number of bird deaths could very easily escape notice by most people.
Either way, I still wonder why this story was selected and not some other story (there is only so many stories a news paper can write) and because I have become cynical I assume that it was either a PR agency or pandering. I have not heard any evidence for anything else.