Bence Mate/naturepl.com
Are there any species of bird that hiccup? If so, why would they do this?
Freya Smith, Mosgiel, New Zealand
Getty Images/Maskot
Why do cabbages exist? What is the point of having a tight bundle of leaves that don’t attract pollinators and shield each other from the sun? Does its structure affect its ability to photosynthesise?
Tim Stevenson, Great Missenden, Buckinghamshire, UK
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