I caught an interesting interview on CBC Radio's "As It Happens" this evening, discussing the Loggerhead Shrike with Rebecca Magnus of Nature Saskatchewan. There was a good description of the bird's interesting life history, focusing of course on the habit of impaling prey on barbed wire and thorns. There was also discussion of the threats to the species and the decline in the Alberta and Saskatchewan populations.
To listen to the interview follow this link, click on "Listen to Part 2", then fast forward to about 17:20. More information on the Shrike monitoring program can be found at Nature Saskatchewan. Lastly, here's a photo of the bird in question, taken by the interviewee - click on the image to link through to their Flickr account: