Author: Antoine Vekris
E-mail: avek@mac.com
Submitted Date: August 20, 2008
Published Date: October 6, 2008
This comment was originally posted as a “Reader Response” on the publication date indicated above. All Reader Responses are now available as comments.

Hello,

very interesting paper, even for the absolutely-not-specialist I am.

While reading it I was wandering what kind of mirrors magpies may be used to in the wild. The only answer I came up with are 'water mirrors'.
Could an horizontal disposition of the mirror change the behavior of Harvey and Lilly?
Rather rare to have 'somebody else' beneath them while drinking in a pond.

And thank you for the 'goodies'.