Maine Coastal Islands National Wildlife Refuge in Acadia National Park

Seabird colonies on offshore islands; keep distance, nesting season Apr 1–Aug 31.

When to come

Dawn and dusk are best for birdwatching; seabird nesting peaks mid-May to early August.

Maine Coastal Islands National Wildlife Refuge spans over 9,400 acres with 76 offshore islands and four coastal parcels along 250 miles of Maine’s coastline. It’s a focus for seabird colonies and other small coastal creatures; nesting season access is restricted April 1 to August 31 to minimize disturbance. For observers, binoculars and distance from wildlife are essential.

Quick facts

Scientific Name: Multiple seabird species (no single scientific name).
Species Type: Birds (seabirds) and occasional marine mammals in surrounding waters.
Conservation Status: Varies by species; includes endangered roseate tern.
Size Weight: Varies by species.

Species profile

Scientific Name: Multiple seabird species (no single scientific name).
Species Type: Birds (seabirds) and occasional marine mammals in surrounding waters.
Conservation Status: Varies by species; includes endangered roseate tern.
Size Weight: Varies by species.
Lifespan Wild: Varies by species.
Identifying Features: Roseate terns with pale pinkish plumage, Atlantic puffins with colorful beaks, razorbills with chunky bodies and white facial markings, Leach's storm-petrels, herring and greater black-backed gulls, double-crested cormorants, and common eiders.
Population In Park: Supports significant nesting colonies for numerous seabird species; exact counts not published.

Where & when to look

Where To See: Mainland divisions such as Petit Manan Point; boat tours view nesting seabirds on Petit Manan, Seal, and Machias Seal islands.
Best Viewing Times: Dawn and dusk; seabird nesting peaks mid-May to early August; marine mammals present year-round.
Sighting Frequency: Seabird nesting occurs mid-May to early August; marine mammals are present year-round with seasonal migrations.
Habitat Description: Coastal islands, forested headlands, estuaries, freshwater wetlands, salt marshes, mudflats, open ocean.
Activity Pattern: Seabirds are diurnal; marine mammals surface to breathe and feed year-round.
Migration Patterns: Marine mammals migrate seasonally; seabirds often follow nesting and feeding cycles in the Gulf of Maine.

Wildlife safety

Dangerous: 0
Viewing Distance Required: Maintain distance: 100 yards for whales/dolphins, 50 yards for seals; observe from distance and avoid nesting areas.
Safety Precautions: Observe from a distance; never disturb nesting sites or marine mammals; stay on marked trails; closures during nesting season must be respected. If you encounter stranded wildlife, report to the Marine Animal Reporting Hotline: 1-800-532-9551.
If Encountered: Back away slowly; speak calmly; do not touch or feed wildlife.
Never Feed Approach: 1
Report Sightings: 1
How To Report: Report sightings to refuge staff during visits or through official Maine Coastal Islands refuge channels.

Photography & conservation

Best Photo Locations: Mainland vantage points at Petit Manan Point; sea cliffs along Penobscot Bay; boat tours offer close views of nesting islands.
Recommended Equipment: Binoculars; telephoto lens 300mm+; sturdy tripod; field notebook.
Ethical Photography: Keep a long distance; do not bait or attract birds; avoid blocking trails or boat routes; never use playback devices to lure birds.
Conservation Threats: Human disturbance to nesting sites and habitat; climate-change–related shifts in coastal ecosystems.
Protection Efforts: Seabird colony management; nesting island access restrictions; adherence to NOAA distance guidelines; public safety messaging.
How Visitors Help: Drive slowly in viewing areas; secure food to avoid attracting wildlife; stay on marked trails; observe closures and signage.

Viewing advice

Best Time To Visit: Dawn and dusk are best for birdwatching; seabird nesting peaks mid-May to early August.
Viewing Tips: Look for distinctive plumage cues and behaviors;
Scan treeline for perched seabirds;
Listen for calls to aid identification;
Early risers often see more activity.
Tips Advice: Observe from mainland vantage points like Petit Manan Point; boat tours provide views of nesting seabirds on Petit Manan, Seal, and Machias Seal islands.
Listen for seabird calls to aid identification.
Stay on marked trails and respect nesting island closures (April 1–August 31).
Bring binoculars and a telephoto lens for distant subjects.
Accessibility: Mainland viewpoints accessible; island access restricted during nesting; boat tours provide island viewing options.
Family Friendly Notes: Keep children within sight; explain distance rules; use binoculars to observe without approaching wildlife.

More details

Lifespan Captivity: Varies by species.
Diet: Seabirds feed on fish and marine invertebrates; marine mammals prey on fish, squid, and crustaceans.
Breeding Season: Seabird nesting mid-May to early August.
Nearby Facilities: Mainland viewing areas such as Petit Manan Point; no facilities on seabird islands; check with refuge staff for current amenities.
Recent Sightings: Check with refuge staff for recent sightings or areas of notable activity.

Location

Photos

Rocky shoreline at Maine Coastal Islands National Wildlife Refuge, a coastal area within Acadia National Park.

Hollingsworth Trail signpost along a gravel path in Acadia National Park, Maine, with meadow and forest in the background.

Trail through a Wildlife Viewing Area inside Maine Coastal Islands National Wildlife Refuge, Acadia National Park.

Maine Coastal Islands National Wildlife Refuge in Acadia National Park shows expansive shrublands and tidal pools under a blue sky.

Frequently asked questions

Will I see large predators at Maine Coastal Islands Refuge?

No. The refuge focuses on seabirds and small coastal wildlife; there are no bears, moose, wolves, or cougars here.

Are the seabird islands open to the public year-round?

Access to seabird islands is restricted from April 1 to August 31 to protect nesting birds; mainland viewpoints remain accessible.

What distance should I keep from marine mammals?

Maintain at least 100 yards from whales and dolphins, and 50 yards from seals.

What gear helps during visits?

A good telephoto lens (300mm+), binoculars, and a sturdy tripod help you observe without intrusion.

How can I report wildlife sightings?

Tell refuge staff during your visit or use the refuge’s official reporting channels; they appreciate citizen science and updates.

Moose

Meet the biggest deer around, the moose. Beautiful beast, wide berth required.

Beaver

Nature's master builders — nocturnal engineers of streams and wetlands. Watch quietly from a distance!

Bald Eagle

Recovery champion of the skies — spot the white head and tail hunting fish over open water. Keep your distance!

White-tailed Deer

Look for the white flash! Graceful deer common across many parks - stay 25 yards back.

Black Bear

North America's most widespread bear — a powerful omnivore. Keep 100 yards back, always.

Bobcat

Nocturnal master hunter with a black-tipped bobbed tail. Elusive, solitary, and rarely seen.

Sources

Editorial review: YourNPGuide Editorial Team. Information is compiled from official sources, verified traveler reviews, and editorial research; no firsthand visit is implied unless explicitly documented. Learn how YourNPGuide works.

Last updated January 2026. Report an issue.