This is Fredge, The birthday frog. If its your birthday then tell me and I'll send you him on your birthday. Let him travel through Tumblr and see many faces and birthdays.
The obvious, but kinda lame and not entirely true answer is that they're government drones. It is true for pigeons, eagles (only in the US), and sparrows, but there is no evidence that suggests they're government drones
Wait actually owls don't drop banners so they might be drones too, but that's just a hypothesis
The second also sort of true answer is that they're dinosaurs. While birds are descended from dinosaurs, they're not technically classified as dinosaurs but for the sake of catchiness and marketing we can say they're dinosaurs
So we don't really have a satisfactory answer; Birds aren't drones but they also aren't dinosaurs. This is where my new theory comes in: the Mole Theory of Birds. This theory states that birds are actually, you guessed it, candy!
What, were you expecting something else there? Well too bad, birds are candy. Deal with it, sunshine 🩷