The government has been lying to us all along. Those things you see flying around in the sky are not "birds," but machines. More specifically, they are government surveillance drones.
There is an abundance of evidence to support this claim.
For example, did you happen to see any "birds" during the government shutdown? I didn't think so.
Have you ever wondered why birds sit in big groups on top of power lines? This is because they are recharging. I mean, what else would they be doing? Also, another source of power for the drones are those so-called "nests." "Nests" are charging stations for the robots (used if there are no power lines near by).
Also, have you ever noticed that birds often choose certain types of trees to "make their nests" in? This is because certain trees are cybernetically enhanced by the government in order to charge the "birds." Take, for example, an elm tree seed. If you crack it open, you will see a tiny glimmer of silver. This is actually a motherboard.
In fact, the word "birds" is actually an acronym:
The government has created these "birds" because they want to sell our private information to Google and other massive corporate entities.
It is spectacular that the government has kept the truth hidden for so long. But the truth is finally revealed, and they will face the consequences of their actions.