So I have Runners, 300s, Pekins, Buffs and Harlequins. I have 11 females. I am only getting 4-5 eggs a day. So I do not think they are all laying. I have never had a 6 egg day. Ever. I have been getting this many eggs for over a month now. The average egg size is about 52-68 grams. (ranging from 2 -3 ounces approx each egg) Now these eggs are easily fitting in standard egg cartons. Every now and then I get a double yolker that will go 95 grams or so- those won't fit in the cartons. Duck eggs seem to feel a little heavier for their size when compared to chicken eggs. But I am not having any issues with fitting duck eggs into chicken egg cartons. Is this everyone else's experience with ducks eggs? So size wise they are not very big but they are very heavy. When you look at this guide- http://pubs.ext.vt.edu/2902/2902-1091/2902-1091_pdf.pdf For sizing (chicken eggs I assume) generally. Also if you see Metzers site (where 8 of my females came from) my egg size and what their site says aren't matching up yet. http://www.metzerfarms.com/DuckBreedComparison.cfm?CustID=1162152 How long would a duck need to be laying before their egg size begins to be more of what it 'should' be? I seldom get any eggs over 68 grams. Months? A whole laying season? Mine have only been laying about 6 weeks so far... Per dozen my yield fluctuates from 30 ounces to 36 ounces (thats not counting any double yolkers). So even when I get a 36 oz dozen- the eggs are still not what I would consider jumbo sized but are indeed heavy. I wonder what would make the duck eggs seem so much more dense? Anyone else experience this?