Big enough to do the birthing job in relation to the size of the egg laying chicken.
seagull's eggs are about the size of an average chicken egg to 2x the size.
Slightly smaller than a chicken egg.
No! because they body can only adjust to different types of food and a egg is to big for a chicken mouth(not if there mouth is really big).
It would be about half the size of a small chicken egg or slightly smaller than half.
It is possible that the chicken might - I have had a chicken hatch a turkey egg, a duck egg and of course a chicken egg. My duck has hatched turkeys, ducks and chicken, and my turkey had hatched turkeys and chickens (though we had to take the eggs off her when they started to hatch because she is a big turkey, and squashes them). It the egg is not too big for the chicken, I think it should be alright. You've just got to make sure that she doesn't turn the egg out of the nest for either being to big, not enough room with other eggs, or any other reason. I think it would be best if you only give the hen the egg, and maybe 1 or 2 chicken eggs if she is a big chook. You could always try an incubator if you have one too. Good luck of hatching it!
1:1
Not sure exactly how big the yoke is, However an ostrich egg is equal to 24 chicken eggs. Hope that helps
a chicken egg would round about 60 or 50 grams.
A typical chicken egg is about 2 inches in length and 1.5 inches in diameter.
a chicken egg is about 50g :)
The Egg! Eggs came from reptiles, and dinosaurs. And since chickens evolved from reptiles and dinosaurs, there must have been an egg for the chicken to develop in and hatch out as a chicken. The Chicken! God created the animals, not eggs. Reference: KJ Bible, Genius Chapter 1