Recuperation journey: Egg shells and blue jays

I threw egg shells out for the blue jays this morning, and of course the shells dropped under the snow. 
To my surprise about an hour later a blue jay came over, pulled one out of the snow and flew away. 
Now I know they can smell the shells. I wasn't sure if they only found them by sight. 

Below is one of the five blue jays hanging around here this morning. Photo taken through the window. I haven't ventured outside.
I just missed getting a picture of the one grabbing the egg shell. 
Next time!