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Years later, Suzanne Simard, then an ecologist with the British Columbia Ministry of Forests, demonstrated two-way carbon transfer in a forest between young Douglas fir and paper birch trees.

A garden on the Rue Vivienne side has been planted with species reminiscent of the book: paper mulberry, paper birch, Chinese palm.

What can gardeners do if their yards include the moth’s preferred foods — not just oak trees, but apples, willows, paper birch and all those Hamamelis cousins, among others?

Overhead, woodpeckers tapped their rhythmic codes into the dead wood of paper birches.

In Saskatchewan and Manitoba, just after the snow melts but before flowers start to bud, Pat Bruderer, 67, searches for paper birch trees.