It it's true that 50% of eggs hatch, 50% of fledglings survive, and 50% of those live one year, then 12.5% of bird eggs turn into one year old birds.
 
50% of 50% of 50% is 12.5%  You multiply (.50)X(.50)X(.50) 




Vote for your city's best dining and nightlife. City's Best 2008.
------------------------------------------------------------
The Audubon Society of Missouri's Wild Bird Discussion Forum
List archives: https://po.missouri.edu/archives/mobirds-l.html