On the Front > Biodiversity

The Rocky Mountain Front represents a biological treasure of unparalleled diversity, from charismatic megafauna, such grizzly bear and bighorn sheep, to Arctic grayling and other disappearing native Montana fish, to rare flowering plants, such as the corralroot orchid and several variety of primrose, to the northern bog lemming. Biologists have recorded more than 700 plant species, as well as 290 species of wildlife on the Front: 72 mammals; 190 birds; seven reptiles; eight amphibians; and 13 fish. It’s not simply the Front’s biodiversity that is celebrated, but the integrity of the underlying ecosystems.

Big game: Hunters treasure the Front as a place to stalk no less than 10 big game species, including seven prized ungulates: mule deer, elk, moose, bighorn sheep, mountain goat, pronghorn antelope and white-tail deer. The Front is home to the nation’s most significant concentrations of elk outside Yellowstone and the largest herd of bighorn sheep, pegged at 600 to 700 head.

Native fish: Of the 13 fish species found on the Front, many are represented in remnant populations of vanishing native species, such as the once plentiful cutthroat trout and the ever-rare minnow hybrid, the redbelly/fine-scale dace, found in Pine Butte Swamp Preserve. The Front has not historically been a hotbed of piscine diversity, but it does offer promise as the last best place to recover signature Montana natives, such as Arctic grayling, westslope cutthroat and threatened bull trout east of the Continental Divide.

Birds: Among the 190 bird species found on the Front, there are at least 21 species of raptors, including nine species of owl and some of the densest concentrations of golden eagles. Fourteen species of duck and six species of grebe are known to breed here. Sandhill cranes, “a living fossil,” migrate along the Front with small numbers staying to breed. Other uncommon birds include trumpeter swans, curlews, white-faced ibis and white-tailed ptarmigan.

Flora: In 1996, The Nature Conservancy set out to document the rich array of plant life on the Front. Botanists David Hanna and Peter Lesica studied a narrow area bounded by the conservancy’s Pine Butte Swamp Preserve on the east to the 8,580-foot summit of Ear Mountain on the west—comprising a swath of land known in science as a transept. The botanists recorded a staggering 682 plant species from 71 families – one-third of all plants found in Montana. This plant diversity reflects the collision of landscapes found on the Front. This transition zone sandwiched between mountains and plains features alpine highlands, limber pine and Douglas fir forests, grasslands and a unique groundwater-fed wetland habitat, known as a fen, at Pine Butte Swamp.


