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AAP
AAP
Environment
Rachel Jackson

The fight to protect the harbour city's aquatic natives

Sydney Harbour Sydney
Recent surveys show Little Penguin numbers in Sydney Harbour have declined. (Jenny Evans/AAP PHOTOS)

The heart of one of Australia's most densely populated cities might seem like an unlikely home for a penguin colony and two species of seal.

But beneath the harbour surface, Sydney is home to thousands of marine species, which have prevailed through 250 years of urbanisation and development.

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