The trembling poplar, whose white trunks protrude from the Utah earth, holds a record that may not be immediately obvious: behind the modest surface, there exists what could possibly be the heaviest living being on earth. The network of roots of its 40,000 trunks is connected underground and thus forms a single organism that spans 43 hectares and would weigh six million kilograms. It is aptly named “Pando”, from the Latin for “to expand”. Ironically, wildfires have presumably enabled the vast expansion of the tree: fires destroyed the trunks, but never the root network, which subsequently sprouted anew on the surface. Without this survival mechanism, other trees, mainly conifers, would have competed with the tree, which is sensitive to the dark, for space and resources. Life as a poplar grove, however, is not entirely without danger: fire suppression by humans, as well as grazing of young trees by deer and cattle, have increasingly afflicted the record holder in recent years.