An 83-year-old woman was seriously injured after being gored by a bison last weekend in Yellowstone National Park, the National Park Service said.The bison was “defending its space,” and approached within a few feet of the woman on Saturday, the park said. It lifted her up about a foot off the ground.Her current condition is unknown, and the incident is being investigated, the park said.Bison are not usually aggressive, but can be when defending…