Blue dot on duck egg shell

[lindseyr1980]

I can post a photo later, but the last 2 duck eggs I collected had a blue/teal dot (almost looked like somebody took a fine tip marker and put a dot on the egg shell). It was on the top of the egg as it lay there. Any clue as to what this might mean?

 

[Ol Grey Mare]

Pictures are definitely going to be helpful in answering this for you. In the meantime, can you tell us a bit more about your ducks - what breed are they? What color was the rest of the egg shell? Where are your ducks currently laying - in a nest of their own choosing/design or a nesting area you have provided? Does anyone else have access to your duck's nest? Can the spot be easily removed - have you tried dry wiping, fingernail scraping or washing and, if so, what happened?

 

[lindseyr1980]

Peking ducks. 2 male, 1 female. They roam where the want, and she tends to just drop her eggs in random places. Lately they have all been in the same general vicinity though. Typically the eggs are all white. They spot does wipe away when scraped with a fingernail.