A unique phenomenon has appeared in Jasper National Park after the 2024 wildfire. The locals call them “cheetah” or “leopard” trees after their spotted black and yellow appearance, and they’re the result of an explosive release of heat and pressure courtesy of the moisture that hides behind the thin outer bark of lodgepole pine trees. “The first time I saw them I thought maybe it was a woodpecker flaking the bark off burned trees, but that’s not actually what’s happening,” says Jasper National Park Resource Conservation Manager David Argument. “In an intense fire situation, the moisture in the sapwood beneath the bark, which can have quite high moisture content, is heated to steam so quickly that it turns into steam explosively and flakes off those patches of bark.”