Helen Sullivan
Helen Sullivan is the world news liveblogger and reporter on the Guardian's foreign desk in Sydney. She also writes a fortnightly column about animals. Twitter @helenrsullivan
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The nature of ...A piranha: it is boiling the water you’re swimming in and taking bites out of youThey don’t chew: they bite, the meat goes straight into their stomach, and they bite again
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A symbol of spring and rebirth, the robin is a favourite of gardeners and poets alike
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How does a species survive hundreds of millions of years unfazed? You must live in a shell – and it must grow with you, chamber by chamber