Ours is a Black Australorp, but that might not be what yours are. Australorps are dual-purpose birds, so are a bit heftier than egg-layers like Golden Comets, and their eggs are definitely large (although not as large as Golden Comets'). This chart might help you pin your variety down: http://www.ithaca.edu/staff/jhenderson/chooks/chooks.html
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