Happy birthday, Yellowstone

The idea of the national park is 150 years old today. On March 1, 1872, President Ulysses S. Grant signed an act setting aside Yellowstone as a public park. It wasn’t the plan, but it ended up being the first of many. Over the century and a half that followed, the United States added another 62 parks and hundreds more federally-protected scenic areas, monuments, seashores and rivers.

The concept of the national park has been called “America’s best idea,” but as Yellowstone has shown, the idea itself has evolved dramatically over the years.

The coyote and the river otters

Yellowstone National Park is home to nearly 400 species of animals. If you’re a wildlife photographer, the hope is that you will get to capture species interacting with each other.

A bald eagle swooping down to catch a fish is a somewhat common sight. Spend enough time there and you’re also likely to see a fox leap to pounce on a vole. The big hope, of course, is to see one of the park’s famous wolf packs hunt a bison or an elk, but that activity usually occurs miles out of sight.

On my latest trip to Yellowstone, however, I got to see a wildlife encounter that at first glance seemed downright strange: a standoff between a coyote and river otters. And it took place on ice covering the Yellowstone River.

Behind the scenes: Winter moose

Daylight Saving Time begins this weekend for most people. It's a sign spring is near, so I figure I have only a few days left to share images from this past winter. I met this moose in early January in the northeastern portion of Yellowstone National Park in Wyoming. His pose and the snow-covered background make this one of my favorite images from that trip.

Using their heads to survive winter

It seems crazy to spend the winter living on a mountaintop, but the wildlife of Yellowstone National Park do that every year. And they somehow manage to thrive. Life finds a way.

While I’ve lost count of the number of times I’ve visited Yellowstone, I recently got a chance to make my first winter visit. I got the full experience. Nearly a foot of snow one night. Temperatures as cold as 9 below — Fahrenheit, not Celsius. And I developed a new respect for the animals that I’d photographed so many times before in less challenging weather conditions.