The bird on the left appears to have an obvious hook to its beak, that is absent from the bird on the right.

Sibley says of the Northern Shrike: "large bill with obvious hook"

Sibley says of the Loggerhead Shrike: "stubby bill without obvious hook at tip"

Given the similarity in plumage, I took the contrast in the bill to be diagnostic.

The difference, however, appears to be not the presence vs. absence but in the degree of the hook.

Because of this, I have not counted the Northern Shrike as an additional species for this area.

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