text: Three adult birds shield the fronts of the young, while also spreading their wings and ruffling their feathers to warn predators?
classes:  No, the young are shielded by three adult birds, who are threatening their enemies by ruffling their wings.  Also, the young are shielded by three adult birds, who are threatening their enemies by ruffling their wings.  Yes, the young are shielded by three adult birds, who are threatening their enemies by ruffling their wings.