The island is home to unique and endangered flora such as Brachychiton incanus and a variety of birdlife such as Rufous Night Heron, Little Eagle, Brown Falcon, Whimbrel, Tawny Frogmouth, Great Bowerbird and Rainbow Bee-eater.
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King named the island after the Duke of Cambridge at the time, Prince Adolphus.
Adolphus Island splits the southern end of the sound with a navigatable channel being found on the western arm.
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