text: Three adult birds shield the front of the young, while also spreading their wings and ruffling their feathers to warn predators?
classes:  No, the only way to protect the cubs is to flap their wings, feathering threateningly.  Also, the only way to protect the cubs is to flap their wings, feathering threateningly.  Yes, the only way to protect the cubs is to flap their wings, feathering threateningly.