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Spinning a "mucus net" off its paddle-like foot-wings to trap algae and other foods, the swimming snail species Limacina helicinia is no bigger than a bean. But the discovery that it and at least 234 other species inhabit both Arctic and Antarctic waters is big news to biologists.

Megaherbs flourished in Antarctica Wednesday, 19 March 2008 Stephen Pincock, ABC This daisy-like 'megaherb' may have once grown in Antarctica 2 million years ago before spreading north when the last ice age started (Source: David Norton) Giant flowers found on Australia and New Zealand's sub-Antarctic islands are probably survivors of lush forests that covered Antarctica before the beginning of the last ice age nearly 2 million years ago, scientists say. The flowers, known to researchers as megaherbs, grow abundantly on the tiny windswept islands such as the Snares, Auckland and Campbell island groups. Dr Steve Wagstaff from Landcare Research in...

Antarctic craters reveal strike The asteroid may have raised sea levels by up to 60cm Scientists have mapped enormous impact craters hidden under the Antarctic ice sheet using satellite technology. The craters may have either come from an asteroid between 5 and 11km across that broke up in the atmosphere, a swarm of comets or comet fragments. The space impacts created multiple craters over an area of 2,092km (1,300 miles) by 3,862km (2,400 miles). The scientists told a conference this week that the impacts occurred roughly 780,000 years ago during an ice age. When the impacts hit, they would have...