self.nbBird = 5
    self.birdTab=[]
    i=0
    while i<self.nbBird:
        self.birdTab.append({'y': 350, 'jump': 0, 'jumpspeed': 10, 'gravity': 5, 'dead': False, 'hitmask': pygame.Rect(65, 50, 50, 50), 'sprite':0})
        i+=1