Trees do much more than we can see. Far from being quiet and alone, trees talk to each other, share resources, and send warnings. This National Tree Week, we’re writing about the incredible secret lives of whispering trees and the fascinating story of how animals like giraffes have learned to listen.
The Hidden Network Beneath Our Feet
Scientists have discovered that trees are connected through underground fungal networks, known as mycorrhizal networks, or the “Wood Wide Web.” These networks link the roots of different trees, allowing them to share nutrients and send warning signals. Trees use this network to protect each other from threats like drought or pests. In exchange for sugars, fungi help carry these messages and even trade nutrients between trees. This is a hidden support system, one that keeps forests strong and connected.
How Trees Warn Each Other – and How Giraffes Know to Listen
One amazing example of tree communication is found in African acacia trees. When giraffes start to munch on their leaves, acacias release a gas called ethylene. This gas warns nearby acacia trees to defend themselves by filling their leaves with bitter tannins. The leaves then taste bad and can even be toxic if eaten in large amounts. Giraffes have learned to move upwind to avoid the trees that have been “warned,” outsmarting the acacias’ defence!
Trees Make Sounds We Can’t Hear
Recent research has shown that trees make sounds in response to their environment, though these sounds are far beyond human hearing. When trees are under stress—like during droughts—they emit high-frequency sounds as tiny bubbles in their xylem (the water-conducting part of the tree) burst. This process, known as cavitation, might serve as a distress signal to nearby plants or fungi within the network. While we can’t hear these sounds without special equipment, scientists are exploring whether these stress signals could help detect issues in forests early. Understanding these “tree whispers” could transform how we monitor forest health, potentially warning us of droughts, disease, or environmental changes that threaten trees long before visible signs appear.
Learning from Nature: Biomimicry in Action
At Rockford’s Rock Opera, we love exploring biomimicry – how nature’s clever ideas can inspire human solutions. Scientists are also drawing inspiration from trees’ structural strength and resilience, particularly in the way tree branches break. Trees are engineered by nature to withstand high winds, heavy snow, and other stresses. When a branch breaks, it does so in complex ways that reveal the strength and flexibility of different wood types. Researchers now use models based on tree fractures to develop better materials and structures, simulating the natural “fracture mechanics” of wood. By studying the microscopic details of how wood fibres stretch, crack, and hold together, scientists are developing stronger, more resilient materials for building and design – all inspired by the humble tree’s ability to withstand nature’s forces.
How to Celebrate National Tree Week and Support Our Whispering Trees
National Tree Week, brought to you by The Tree Council and partners, brings together the conservation sector, volunteers and tree-lovers to mark the start of the annual tree planting season (23rd November – 1st December). Discover how you can get involved on their website.
Here are some ideas this National Tree Week?
Planting native trees helps create more “Wood Wide Web” networks that support wildlife.
Learn and Share:
Find out more about how trees communicate and help each other. The more we know, the better we can care for them.
Support Forest Conservation:
Consider donating to groups that protect old forests. These mature trees play a key role in keeping the network alive.
Why Trees Matter More Than Ever
Trees are more than just scenery. They are protectors, communicators, and allies in our fight for a healthy planet. This National Tree Week, we should all appreciate the quiet wisdom of trees – and all they do for us and the natural world.
Happy National Tree Week from Rockford’s Rock Opera! 🌍🌳
Resources for Teachers and Families:
In addition to our audiobooks, our website also provides a wealth of free resources for educators and parents, including lesson plans, slides, and information on endangered species. These materials can be used to supplement your child’s learning experience and further deepen their understanding of extinction and conservation.
Download our FREE lesson plans and slides about Extinction and Biomimicry. We also have a selection of classroom activities on our website.
For even more exploration of the natural world, tune in to our Stories, Science & Secrets podcast for kids. Join Matthew, Elaine, Steve Punt and special guests, as we delve into the fascinating world of biomimicry and the inspiring ways science learns from nature’s genius.