Did not feel well enough to attend church so I was lurking around the internet. Seems the double yolk hatching is very very rare. They think these birds might have come from a double yolk.
http://news.yahoo.com/s/ap/20080719...oined_birds;_ylt=ApuaS.2CC3y_0D6nZNdIOU2hOrgF
http://news.yahoo.com/s/ap/20080719...oined_birds;_ylt=ApuaS.2CC3y_0D6nZNdIOU2hOrgF