Eagle Island is the only breeding site for Cattle Egrets in Massachusetts.

Eagle Island is one of the islands in the Essex County Coastal Bird Islands Important Bird Area.

Eagle Island is a small island located in Salem Harbor. It is part of the Salem Maritime National Historic Site and is accessible by boat. During the colonial era, it was used as a fishing station and a quarantine site for sick sailors. The island played a role in the American Revolution, as it was the site of a skirmish between British and American forces in 1775.