1. 
   Birdstone
   (from the article `Equestrian Sports`) Belmont Stakes winner Birdstone was retired in November when he was diagnosed with a bone chip in his left front ankle. He won five of nine starts ...
   Found op http://www.britannica.com/eb/a-z/b/68
   
   
2. 
   Birdstone
   Owned and bred by Marylou Whitney of Whitney family racing fame, Birdstone had won the Champagne Stakes, a leading race for two-year-olds, at Belmont Park in 2003, but had not been a factor in the first two Triple Crown races (finishing eighth in the Kentucky Derby and skipping the Preakness Stakes...
   Found op http://en.wikipedia.org/wiki/Birdstone
   
   
3. 
   Birdstone
   Typically a stone artifact, thought to be an Atlatl weight which was shaped like a bird. Quite possibly some other type of cerimonial object. Some birdstones have buldging or 'Pop' eyes. Usually made from a banded slate.
   Found op http://www.encyclo.co.uk/visitor-contributions.php
   
   

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