To protect the refuge's wildlife and habitats, please comply with the following:
Seabird islands are closed to the public during the nesting season, April 1 - August 31, to minimize disturbance to the birds. Commercial tour boats provide views of nesting seabirds on Petit Manan and Machias Seal islands.
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The refuge's islands are as individual as finger prints: some support spruce-fir forests, others are treeless, covered by shrubs and grasses. Still others are mostly bedrock, with little vegetation. Some combine the three. The various habitat types attract a variety of bird species to the islands.