recently i just caught two wild chicks that were messing around by my chicken cages. i brought them home to raise them. i'd say they are about 3-4 weeks old. every now and then when i watch them they will flap there wings and fly at each other. kind of like when roosters fight. looks like they're fighting but they don't hurt each other and it only lasts maybe a couple seconds. does anyone know why they do this? are they both boys?