Penguins are in peril because of extreme environmental conditions linked to climate change, research has shown.
At both locations, the beguiling birds face an uncertain future.
Climate change is killing chicks from the world's biggest colony of Magellanic penguins at Punta Tombo, Argentina, by increasing the rate of drenching rainstorms and heatwaves, say scientists.
Meanwhile Adelie penguins on Ross Island, Antarctica, are finding it harder to feed as melting sea ice fragments to form giant icebergs.
Protected only by a downy coat, the Magellanic chicks can be left to struggle and die when rainstorms hit their colony.
At other times, faced with extreme heat, their lack of waterproofing means they cannot cool off by taking a dip.
Dr Ginger Rebstock, from the University of Washington - who took part in a 27-year study of the 400,000-strong Argentinian colony, said: "We're going to see years where almost no chicks survive if climate change makes storms bigger and more frequent during vulnerable times of the breeding season, as climatologists predict."
During the course of the study, an average 65 per cent of chicks died each year, with some 40 per cent starving.
Climate change was blamed for an average 7 per cent of chick deaths, but in some years was the most common cause of death. In one year, 43 per cent of all chick deaths were attributed to climate change, and in another the figure was 50 per cent.
Starvation and the weather were likely to interact increasingly as the climate changed, according to the researchers.
"Starving chicks are more likely to die in a storm," said Professor Dee Boersma, also from the University of Washington, who led the study.
At Ross Island, scientists spent 13 years collecting data on the foraging ability of chick-rearing Adelie penguins, which are dependent on year-round sea ice.
They found that under "normal" conditions they were able to cope with changes in sea ice concentrations.
But the appearance of giant icebergs reduced their chances of catching fish prey.
Both studies appear in the latest edition of the online journal Public Library of Science ONE.
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