Photographic gallery — Yellowstone National Park

Blazing skies above the dormant Old Faithful Inn warm a cold December evening.

A rutting bull bison in his prime pauses in Yellowstone's Little America before wandering off in search of cows.

Though much maligned in the West, it's hard to look into the eyes of a coyote and not sense their intelligence.

While watching a black bear sow and her yearling grazing on grass in Yellowstone, I was surprised by this much bigger bear stepping out from the forest.

A bull moose feeds on aquatic vegetation in Yellowstone's Floating Island Lake one summer evening.

A lone bull rests a moment while feeding in Yellowstone's Round Prairie. The deep and heavy snows of 2010-2011 taxed many bison and elk. As a result, many did not live to see the spring green up.

A young bison calf, with its umbilical cord still attached, scans its new world before hurrying to catch up with its mother.

Two ghostly coyotes crossed my path in the dim light as I walked along the boardwalk near Old Faithful on a December morning. The low light gave Castle Geyser an otherworldly feel.

A curious bison calf lingers to have a a look at people stopped on the road in Yellowstone watching its herd.

Early one morning while camped by Yellowstone Lake's South Arm, I meandered along the water's edge and caught this sepia-toned sunrise.

A red fox, likely with kits to feed, pauses a moment in northeast Yellowstone before resuming its evening hunting.

The Yellowstone River plummets some 300 feet creating the Lower Falls south of Canyon Village. The view from Artist Point rivals Old Faithful Geyser for visitor attractions in the park.

A cold, gray day transforms Electric Peak into a sketch, highlighting its glacially carved features and the inky forest below.

A full moon rises above Yellowstone's Mt. Norris on a still February night. Down the valley, a lone wolf's howls go unanswered.

A colorful sky glows behind the silhouette of a pine forest following a summer storm near Gardner's Hole.

A male goldeneye displays for a female on Yellowstone's Trout Lake.

A pelican glides in for a landing east of Fishing Bridge before joining others searching for trout.

The sun rises softly over Yellowstone's Little America on a summer morning.

On a rainy October morning, with hibernation a few weeks off, a black bear feeds on rose hips along the Blacktail Plateau Drive in Yellowstone.

A sow grizzly crosses the Lamar River one spring evening before taking her two cubs uphill for the night.

A sow grizzly takes a look around a high meadow near Mount Washburn in Yellowstone.

Muted autumn colors lend a subdued mood to this bull moose's landscape as the rut nears.

A bull bison plods along the road near Yellowstone's Trout Lake during the epic winter of 2010-2011. The plowed road allowed easier travel for many animals during a heavy season of snow. This bull eventually lunged up into deep snow and plowed it with its head to look for dried grasses.

Sometimes confused for grizzlies, cinnamon black bears are just a different color of black bear and can often be seen grazing on grass as this one was doing.

A gray-crowned rosy finch pauses for a moment while foraging for seeds below basalt cliffs near Tower Fall in Yellowstone.

In forests in the greater Yellowstone area, fairy slippers can be found in the late spring. Waiting for sunlight to illuminate them through breaks in the pines can be maddening as can waiting for the slightest of breezes to fade. It took more than an hour for everything to come together to make this image near Tower Junction in Yellowstone.

Wind gusts blow across the ridges of Electric Peak as shafts of sunlight flitter in the cold smoke.

Obsidian Creek, smooth and glossy upstream, breaks over stones and before flowing into the Gardner River.

The cold spring water of Obsidian Creek slips downstream over stones and reflects sky and forest.

A coyote carrying one of its pups leaps over a fast-flowing creek on its way to a new den. Their previous home had been underneath a porch of one of Yellowstone's Roosevelt cabins.

An early snow fell on a bull elk and his harem in the northeast of Yellowstone. The bull was bugling at a rival in a nearby meadow.

Bunched-up elk watch for the return of the Canyon wolf pack near Mammoth Hot Springs on an April morning. The wolves, however, dropped down to the Gardner River and trotted west.

A shaft of light illuminates a bighorn sheep near Bighorn Peak in the northwest of Yellowstone.

Sunlight illuminates these shooting stars.

During the epic winter of 2010-2011, many mammals in Yellowstone were pushed to the limits of survival. This moose traveled a creek corridor in northeastern Yellowstone to conserve energy but had to plunge into deep snow to reach the forest to browse.

While driving by Golden Gate, a fierce wind lifted pebbles from the roadside and shot them at my truck. From Swan Lake Flat, I watched as the storm moved away to the north.

More than 300 stairs take you down to the lowest view you are allowed to get of the Lower Falls of the Yellowstone River. The view is well worth the effort of having to climb back up all those stairs!

The Hoodoo Basin (originally named the Goblin Labyrinth) sits near the eastern border of Yellowstone. At different times of the day and in varying levels of light, the rock transforms into interesting shapes and figures, such as these hand-holding goblins.

An adult coyote carrying one of its pups trots toward a new den. The previous den had been underneath a porch of one of Yellowstone's Roosevelt cabins.

A young otter rests for a moment before sliding back into Trout Lake. One of its siblings later became separated and cried loudly from near the outlet before its mother came along and grabbed it by the scruff of its neck.

As winter thaws into spring, a group of bighorn rams surveys the landscape in all directions as they move to a new foraging area.

These pronghorn stopped long enough for a portrait on a mid-winter's day north of Gardiner, Montana. A few moments later, they continued feeding in snow-free patches of grasses.

Mammatus clouds sweep over a forest towards Yellowstone's Electric Peak.

Following a spring snowstorm, many migratory birds that had already returned to Yellowstone moved downslope to where the several inches of snow were melting quickly. A few western tanagers joined yellow-rumped warblers, juncos, chipping sparrows and others to feed on exposed seeds and insects.

Fading sunlight warms a sliver of Electric peak as the foreground rests in the shadows.

Ravens are remarkable birds for many reasons, and a close look at one's wing reveals the beauty of their plumage.

A young bison calf clings to its mother while the rest of the herd grazes nearby.

The alpha male of the Canyon Pack (lawfully) crosses the road between Gardiner, MT and Mammoth Hot Springs on an April morning in 2009.

A coyote surveys the landscape for prey on a spring morning in Yellowstone's Little America.

Keeping an eye on potential rivals, this Barrow's goldeneye circles Trout Lake, feverishly chasing away other males from a female he's hoping to mate with.

A spring snow shower paints this picture of a bull elk in velvet racing through a meadow from some unseen threat in the forest.

A late brood of Barrow's goldeneyes ventures out on an August evening on a quiet stretch of Thorofare Creek in the southwest corner of Yellowstone.