[Maine-birds] shrike versus mocker

I have recently been asked by several people about differentiating a Northern Shrike from a Northern Mockingbird. Quite a few folks saw my shrike photo of today and thought it was a mocker. This is a mistake I've made a few times myself.  I made a collage two photos, one of each bird in similar lighting, in the same tree (at my house in Phippsburg). I'm hoping it will be helpful for some to see them side by side and appreciate how easy it is to confuse them on the fly, so to speak. Hope this is helpful, just don't 'mock' me! :)
link to collage here;
http://www.robinrobinsonmaine.com/BIRDS-OF-MAINE-Showcasing/BIRDS-MEDIUM-SIZED/i-pfSdZRJ/0/M/mocker%20shrike%20collage-M.jpg
 
Robin R Robinson
Phippsburg