Precisely and average just do not go together, there is no way to be precise on an average but here are the egg sizes you requested.
Per egg:
Peewee - less than 42 grams
Small - at least 42 grams
Medium - at least 49 grams
Large - at least 56 grams
Extra Large - at least 64 grams
Jumbo - 70 grams or more
seagull's eggs are about the size of an average chicken egg to 2x the size.
A single large chicken egg has a mass of about 57 grams on average with its shell on. By contrast, a jumbo graded chicken egg has a mass of 71 grams.
The average size of a sea gull's egg is 1 to 2 ounces, depeding on the conditions the parent sea gulls were living in. The amount of food and water can change the size of the egg. The physical condition of the gull also counts, but either way, the eggs are mostly 1 to 2 ounces, as I said before.
a chicken egg would round about 60 or 50 grams.
the size
Not neccesarily...
Big enough to do the birthing job in relation to the size of the egg laying chicken.
The average size of a 3-month-old's stomach is about the size of a large chicken egg, holding around 4-6 ounces of milk or formula.
This can vary dramatically, as the size of the chicken, what type of chicken it is, what it eats, etc. all contribute. The average weight of a chicken egg, however, is usually somewhere between 1.5 and 2 oz.
It would be about half the size of a small chicken egg or slightly smaller than half.
No, every egg unique in shape and size.
3 inches