This video says about itself:
July 3, 2013
A species of Indonesian parrot can solve complex mechanical problems that involve undoing a series of locks one after another, revealing new depths to physical intelligence in birds.
A team of scientists from Oxford University, the University of Vienna, and the Max Planck Institute, report in PLOS ONE a study in which ten untrained Goffin’s cockatoos [Cacatua goffini] faced a puzzle box showing food (a nut) behind a transparent door secured by a series of five different interlocking devices, each one jamming the next along in the series.
See also ScienceDaily on this.
And here.
And here.
And here.
Related articles
- Study: Cockatoos can pick locks and solve complex puzzles for nuts (wired.co.uk)
- Goffin’s Cockatoos Can Solve Complex Puzzles (natureworldnews.com)
- Cockatoo cracks lock with no prior training (newscientist.com)
Dear Kitty. Some blog 
Smart parrots solve five-step puzzle to unlock
treat:
A few feathery burglars revealed new depths to
physical intelligence in birds, scientists say.
http://www.world-science.net/othernews/130703_parrot
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We used to have a blue-front amazon who figured out how to pry open the spring friction latch that kept his cage closed. After getting different types of latches to keep the other latches closed, we finally gave up. He figured them all out. I suspect this isn’t all that uncommon for people who live with the larger psittacine birds.
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More about blue-fronded amazons is at
http://en.wikipedia.org/wiki/Blue-fronted_Amazon
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