Can you identify the young of these small but skilled predators by knowing when they molt?

Loggerhead Shrike

Northern and Loggerhead Shrikes look quite similar, both as juveniles and adults. Apart from structural characteristics such as the longer, more strongly hooked beak of the Northern Shrike, and plumage characteristics such as the face mask of Northern Shrikes not extending above the eye, an understanding of the molt timing of juvenile shrikes can make the winter identification of a distant individual easier. Juvenile Loggerhead Shrikes molt into adult plumage in the fall, while juvenile Northern Shrikes retain their juvenile plumage until spring, so a brownish shrike with a heavily barred breast seen in the winter months will be a Northern Shrike.

Northern Shrike