Bald Eagles mate for life, as do most birds. However, if one dies or is lost, the one remaining will take a new mate. Although male and female eagles have the same coloring there is a difference in size. Females are about 1/3 larger than males. Another way to tell them apart is to measure the height of their bill. The female’s bill is always deeper than the male’s and usually has a larger hook than the males. All this being said it is still hard to tell which of these two is the male or female. It is definitely a mating pair because no two eagles would get this close to each other if they were not a mating pair.