The term 'Bald Eagle Cousins' refers to the two species of eagles that are closely related to the Bald Eagle, the White-tailed Eagle and the Steller's Sea Eagle. Both of these species are large birds of prey with similar characteristics to the Bald Eagle, such as a white head and tail feathers. The crossword solution for this term is ERNS, which stands for the scientific name of the two species, Haliaeetus ernstii and Haliaeetus pelagicus.