Researchers are collecting information on where trees are growing hundreds of metres up mountains.
Scotland's hilltops were once a landscape full of woodlands but tree cover disappeared over thousands of years due to human activity.
"When we are talking about altitudes above 900m that is very, very extreme for a tree to grow," she says. The trees reach the mountains as seeds - often blown on winds or deposited in bird droppings after being eaten."It's a natural process," says Ms Watts - a PhD researcher based in the Highlands with the University of Stirling's Global Change Ecology research group.
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