Why do birds float? Petition to exterminate floating birds.

[Vesperia]

I always see them flying, what's the deal? They can't fly around like a real birds do because of coding.
I guess I just ain't bother by stuff like this in a video game, it is a mob in the game you fight it has to follow the ruleset of the world.

But why can't they fly around like real birds? Why? What excuse can you realistically give other than laziness? You cite "coding" as a reason, and you're correct. That's exactly what it is: poor coding.

Other MMOs have realistically flying birds. They only come down to eye level when you shoot them down.

I don't see why you think this is beyond SE's abilities.