Summer is the prime season for Bird Watching Summer Acadia , as the park becomes a bustling haven for migratory birds returning north for the warmer months. The combination of lush vegetation, abundant food sources, and protected nesting areas makes it a perfect breeding ground for many bird species. From warblers and woodpeckers to seabirds and raptors, Acadia boasts a rich avian diversity that will delight both novice and seasoned birders.