Most large birds of prey are solitary, but not bald eagles!

From USFWS National Wildlife Refuge System:

Most large birds of prey are solitary, but not bald eagles! Large numbers will gather where the fishing is good. Food fights can look dramatic, but seldom result in injuries, and they are not nearly as serious as disputes over nesting territory. 
Photo by Robert Conrad/Audubon Photography Awards. The next deadline is February 19:http://bit.ly/1T4SMqA
National wildlife refuges where you can see bald eagles: http://1.usa.gov/1SsvpYC