Where the black bear toppled ant nests, nearby rabbitbrush grew better and produced more seeds, Grinath and his colleagues reported in the February 2015 issue of the journal Ecology Letters. A camera trap confirmed that bears were the culprit, Grinath said. In four years, bears attacked 26 to 86 percent of the 35 ant nests in the meadow research plot at the Rocky Mountain Biological Laboratory, near Almont, Colorado, the study reported