Seal Island, which sits 21 miles off Rockland, was once home to the largest Atlantic puffin colony in the Gulf of Maine. It is now managed by the Audubon Seabird Institute, and was the second island that Audubon’s Project Puffin restored puffins to after a century’s absence spurred by hunting in the late 1800s. The first was Eastern Egg Rock, six miles off Pemaquid Point.

Both islands were seeded with puffin chicks brought from Newfoundland. Puffins began breeding anew on Eastern Egg Rock in 1981 and Seal Island in 1992.

The Little River winds through the Wells Reserve marsh, which is part of the Rachel Carson National Wildlife Refuge. Unlike many marshes along the Maine coast that have a rocky barrier to the ocean, the Wells Reserve marsh is fronted by a sand beach, which makes it...

“The warming sea temperatures have actually created a real sweet spot for lobster reproduction,” said Brian Skerry, a National Geographic photographer and producer on the recent GBH/PBS series Sea Change, which explores the impact of climate change on the Gulf of Maine.

Skerry, who lives in York, has been diving in the Gulf of Maine since childhood. But when he began diving on the Isles of Shoals for his most recent project, he saw something he’d never seen before: lobsters crawling all over the bottom, digging foxholes in the sand.

“I wasn’t used to seeing that,” said Skerry. “Usually they’re tucked away in rocky crevices and dens.”