There is an interesting article about five birds which nest twice in a single year, in the US and then again in Mexico.
 
The article can be seen here (from Birder's magazine).
 
http://cs.birdersworld.com/brdcs/blogs/field_of_view/2009/10/26/researchers-discover-a-second-breeding-season-for-five-migratory-songbirds.aspx

Larry Lade
Saint Joseph, MO
gcrownkinglet AT yahoo DOT com
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