However, there are notable exceptions in places and times, where eagles congregate in large numbers, find mates for life, joust with rivals and actively communicate with each other with a wide variety of calls. The Chilkat River in Alaska in late Fall and early Winter is a place and time to experience a remarkable gathering of eagles. Each year, over 3,000 eagles come to a confluence of the clear Tsikru and glacial Chilkat rivers to feed on a late season run of chum salmon.