Abstract
-Color of Black-crowned Night-Heron (Nycticorax nycticorax) eggs of known laying order was quantified in a Wisconsin colony. Eggs were of greener intensity on the day of laying and one day thereafter than earlier laid eggs within a clutch. Egg color can be used to identify clutches within one day after clutch completion and to assign laying order within clutches during this period. Received 15 January 1991, accepted 18 March 1991.
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