Bird people are humanoid creatures with a wingspan of 4 meters, they are as tall as humans and the fittest of them weight 72 kilograms or slightly less, so they are quite lighter than the average human.
Bird people have an incredible advantage in any conflict, they don't need to fight and risk their lives, they can just fly over the enemies and drop arrows,flechette, rocks and flaming pots of oil or simply throw spears from above. They can fly 3,800 metres above ground when flying long distances in order to cross continents. Carrying weapons into battles makes flying height lower but still over the kilometer, they only walk when home or when resting.
So, how can bird people be stopped from taking over the world ?
The other humanoid creatures present in this world are:
- Half human, half lion centaurs, they are huge and powerful and can climb
- Alcohol Elves as in my older questions
- Driders or giant
nopespiders as described by Rennan
- Lizardfolk or reptile people
No firearms or such things are invented and everything is like the early 1000's of our world, where the majority of people lived in tribes and small villages but there were a few empires and big cities.