The great bustard is polyphagia bird , but it feeds mainly on plants . the feeding field habitat selection relate with that whether the grassland burn or not last year . the important factors that determine the feeding field selection are the plant species , vegetative cover score . density hemerrocallis minor and the density of pedacularis sp . on burning grasslandsjthe density of vegetation . insects quanlity . plant species richness and the height of plant are the main factors that determine the feeding field selection on unburning grasslands 大鸨是杂食性鸟类，但以植物性食物为主。对于取食地的选择往往跟草原上一年是否被火烧过有关。在火烧地，植物种类数、植被盖度、小黄花菜密度和蒿密度是取食地选择的重要因素；在非火烧地，植被密度、昆虫数量、植物物种丰富度及植物高度在大鸨取食地选择中发挥重要作用。
