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Scientists are investigating the idea that plants make sounds audible to insects, but not to us, which indicate their state of health. These ‘secret sounds’ may influence where an insect lays its eggs - it’s less likely to choose a plant that is in distress. Even ancient trees can struggle with our increasingly hot summers, which is why the Great Oak in RSPB Sherwood Forest is getting extra help, water and nourishment. Dendrometers have been installed to monitor its health, and impacted soil aro...