It's funny how we use the term "bird-brain" to mean stupid, and how birds appear to us to embody the very essence of nonchalance ("free as a bird"), when these creatures are astonishing problem-solvers, architects, artists - and magicians, I guess.
I know that the author Robert Benchley was very, very freaked out by his keen sense of the intelligence of birds. He could barely stand hearing about a breed of quail who, as part of their mating ritual, marched in unison, in straight lines, both forward and backward. Although not sure if the report was true, he contended that "birds should not march backwards in unison - even in myth!"
I wonder what Benchley would have thought of these avian illusionists!