Usa birds XPlane 11 and Xplane 12 Edition. Birds simulation system featuring multilayers of birds covering the entire United States. No less than 60 millions birds are injected by this scenery into the simulator; multilayer system ensure that each flock of birds you come across is unique in shape; number of birds and movement. The birds start to be seen from an altitude of 60 m (pigeons); transitioning into multilayer system up all the way to 500 m altitude above ground. Birds might show the form of big flocks; medium flocks; small flocks; or as single bird couples or triplets. There no fix formation; number how the birds might show in the sky; they free to fly as they pleased. Includes following species: pigeons; goose; crow; bird of prey; seagulls. Compatible with Xplane 11 and Xplane 12. Video Available from: https://youtu.be/9d1ZgthvyLc