Birds

[plague]

but they're fighting against that...

Birdman
Hawkeye from the Avengers
Robin (sidekick to batman, but all the stuff we are revealing about birds makes you wonder if he really is the brains behind the duo)

Counter point:

Hawkeye, not a real bird, has no actual superpowers. HOLLYWOOD WILL NORMALISE YOU WITH OUR SCRIPTWRITING!!!

Robin: Zac Snyder murdered him before he even got on screen.
Also, Zac Snyder murders everybody.

Birdman: never watched it. YOU CANT MAKE ME LIKE THE BIRD BECAUSE OF YOUR QUICK EDITS AND UNDERLYING ISSUES MICHAEL KEATON!!!!