Posted 2/3/17 on the IWS Facebook page:
"The Sauces birds laid and lost another egg today. Looking at the history of the nest, it has failed in 5 of the 9 previous nesting attempts, with 2 different males and 3 different females. Male A-28 was present 2008-2011, and the male A-40 from 2012 to present. Female A-02 was present in 2008-2009 and failed both years. Female A-27 was present from 2010 until she was displaced by A-48 in 2013. A-27 was successful every year except 2013, when ravens took the eggs. Female A-48 was unsuccessful in 2014 and 2015, and had two chicks last year. Why the eggs are breaking so quickly with the current pair is hard to say. Unfortunately, we can't get information on potential contaminates from eggshells; only from egg contents."
A48 has rarely left the nest since the second egg broke. She spent the night there and was on it still as I write.