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Hawaii is known as a natural paradise. It's also known as the endangered species capital of the world. One of the state's most threatened seabirds, the Newell's shearwater makes its home on the island of Kauai, where a small group of environmentalists is working to keep the iconic seabird from disappearing because of collisions with power lines and confusion from artificial light.

Hurricane Lane, now downgraded to a tropical storm, is expected to continue to dump heavy rain in Hawaii on Saturday, as officials warn of flash flooding that could inundate homes and roadways after already pouring more than 3 feet of rain across the island.

Dozens of residents have been forced to evacuate their homes over the past two days, wading through waist-high water, and sometimes spreading brush fires, to safety, while thousands of others remain in shelters.

Geologists are warning that Hawaii's Kilauea volcano — which has been belching toxic gas and oozing lava into a residential area for the past week — could erupt explosively in the coming weeks.

The possibility of such a sudden eruption will increase as lava flows from Kilauea's summit crater down its face and magma falls below the water table, the U.S. Geological Survey said. That could create steam pressure that would then explode.

The volcano could then eject "ballistic rocks" of lava up to several feet in diameter, the USGS said.