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Acorn barnacle

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The acorn barnacle (Balanus glandula) is one of the most common species of the barnacle found on the Pacific Coast, including these that were photographed in Glacier Bay National Park and Preserve in Alaska. Acorn barnacles are typically found in the upper intertidal zone attached to rocks, mussels, and pier pilings. Adult acorn barnacles are hermaphroditic (both male and female) but must mate with other individuals to reproduce.

Glacier Bay National Park is located in southeast Alaska. The park is also an important marine wilderness area known for its spectacular tidewater glaciers, icefields, and tall coastal mountains. The park a popular destination for cruise ships is also known for its sea kayaking and wildlife viewing opportunities.

Glacier Bay National Park is home to humpback whales which feed in the park's protected waters during the summer, both black and grizzly bears, moose, wolves, sea otters, harbor seals, steller sea lions, and numerous species of sea birds.

The dynamically changing park, known for its large, contiguous, intact ecosystems, is a United Nations biosphere reserve and a UNESCO World Heritage site.

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© John L. Dengler
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Glacier Bay National Park, Alaska
The acorn barnacle (Balanus glandula) is one of the most common species of the barnacle found on the Pacific Coast, including these that were photographed in Glacier Bay National Park and Preserve in Alaska. Acorn barnacles are typically found in the upper intertidal zone attached to rocks, mussels, and pier pilings. Adult acorn barnacles are hermaphroditic (both male and female) but must mate with other individuals to reproduce.<br /> <br /> Glacier Bay National Park is located in southeast Alaska. The park is also an important marine wilderness area known for its spectacular tidewater glaciers, icefields, and tall coastal mountains. The park a popular destination for cruise ships is also known for its sea kayaking and wildlife viewing opportunities. <br /> <br /> Glacier Bay National Park is home to humpback whales which feed in the park's protected waters during the summer, both black and grizzly bears, moose, wolves, sea otters, harbor seals, steller sea lions, and numerous species of sea birds. <br /> <br /> The dynamically changing park, known for its large, contiguous, intact ecosystems, is a United Nations biosphere reserve and a UNESCO World Heritage site.