He echoed conservationists' concerns that "a single major event could be catastrophic".
"There should have been lots of penguins there, but actually we could only see 25 groups," he said. Groups vary in size from 10s to up to 1,000 birds.
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Жители Санкт-Петербурга устроили «крысогон»17:52
"Now I'm asking, is that coming forwards towards us? Is it the end of the century?" he asked.