Are you looking for real birds flying in your animation ?
Large time to model a realistic bird
To Set up movements of these complex 3d structures to appear as credible flights
To Render scenes consuming a lot of time and resources if you want hundreds of birds
WITH OUR BIRDS YOU WILL GET
More freedom to include all the birds as you want inside your scenes. Just put them as an independent layers
Reducing extremely the rendering times focusing your hardware resources in other tasks
Unmatched results because they are real birds and, obviously, they fly as real ones