Naturally Speaking

It is not enough to simply say adult male Bald Eagles weigh 25 percent less than female Eagles. Biologists say this feature is an example of reverse sexual dimorphism. In other words, we expect males of a species to be larger than females but in Eagles, Balds and Goldens, the reverse is true.
Otherwise the genders are alike externally and so are most of their habits, including building nests, incubating, feeding, brooding, and bringing food to the Eaglets.
Females generally weigh 10-14 pounds, males a few pounds less but there can be some overlap. Northern birds are heavier, up to 18 pounds for a female in Alaska and 6-8 pounds for the she-bird in Florida. This helps in body temperature regulation.
Even though they both do the work, except when it comes to egg production, the female may do more and therefore body mass may be important when incubating and brooding instead of hunting, finding and feeding.