Reverting to flatworms, some years ago someone trained flatworms to run a maze. (How they got a grant for this is beyond me, but I like it...) Having done this, they ground some of them up and fed them to some untrained flatworms that had never seen a maze. Those fed on their trained colleagues (colleagues? we're talking flatworms here..) could follow the correct path in the maze almost immediately while the un-colleague-fed ones got lost until several runs had been made. Spooky or what? (Source for this was New Scientist not urban legend - can't remember the issue.)