There is no relationship between egg size and size of the adult. Careful examination of eggshells in both modern and extinct animals can tell us something about the way eggs were incubated in the nest.
Egg size also varies markedly among individuals of the same species or population. the largest eggs laid by individual females within a population are generally at least 50% larger, and sometimes twice as large, as the smallest eggs laid by other individuals and approximately 70% of the total variation in egg size is due to variation between clutches, i.e., among individual females, not within clutches. population of Free-living species show marked inter- and intraspecific variation in egg size and fecundity (clutch size). Egg mass scales with body mass across species.
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