Everybody knows that birds are some of the least scary animals ever, right? After all, they're small, they're pretty, they sing, they have sharp talons and pointy beaks, they fly around in huge flocks, they hang out in battlefields and pick the flesh off of the corpses...
In short, they're not always a welcome staple.
Monstrous birds aren't that ridiculous, if you think about it. After all, they're the dinosaurs that survived. As mentioned above, even the cutest birds have pointy beaks and talons, and some birds (such as starlings) fly in flocks of thousands, making them seem like hordes of avian locusts. Many of them are voracious predators, and airborne to boot—just imagine if birds of prey were big enough to swoop down on humans and carry them off. (It might be worth noting that the extinct Haast's eagle could have occasionally preyed on humans, although it wouldn't have been able to carry them.) One should not forget the terror birds, flightless predatory birds up to three meters tall that once roamed South America.
