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.

Pictures can make a monumental difference

About 100 million images will be posted on Instagram today, so it may not seem like one image can make a difference. But last week 100 images did.

We all have a role on Earth Day

A lot of environmental activism focuses on what others need to do. Switching to clean energy. Stopping pollution. Conserving large swaths of land. And so on. But individuals play a role, too. We can’t afford to act as if taking care of the planet is always someone else’s problem.

Look at all the eagles

When I was working on my bald eagle book 10 years ago, the bird often drew attention. Many times when I was photographing one, people would stop and talk about how cool it was to see it.

Fast forward to this past week. I was in a field with several other photographers when a pair of bald eagles circled over us. Nobody else looked up. Short-eared owls were deemed more interesting.

This isn’t a case of something being wrong. Rather, it’s a case of something being right.

We're watching the monarchs vanish

Over the past 20 years, about 98 percent of the western monarch butterflies have disappeared. 98 percent! And the eastern monarchs aren’t faring much better. So I was stunned to read today that federal officials won’t start talking about adding them to the endangered species list until 2024.

The cycles of elk

The clacking of antlers is one of the unmistakable signs of autumn. While elk spend much of the day feeding peacefully, every so often two of the larger bulls will literally go head-to-head in a demonstration of strength. The winner gains mating privileges. You can almost set your calendar by the action.

But there are several cycles on display in this image. The beginning of mating season marks the starting point of one.

The value of urban forests

At the rate things have been going, we’ll likely end this year with 36 million fewer trees. That’s how many trees vanish from urban areas in the U.S. annually.

And while it may seem like we’ve made great strides in conservation, this is one area where we don’t seem to be making much progress. The U.S. Forest Service study found that nearly half the states had significant declines in urban tree cover during the survey period. Just three states ended with more trees.

Remembering the monarchs

It was the spring of 1980 and one of our final kindergarten projects involved watching a pair of caterpillars transform into monarch butterflies. For weeks, we watched them feed on milkweed leaves and then disappear into their chrysalises. When they finally emerged as butterflies, we took them outside to the playground and set them free.

That experience in the classroom near Seattle, Washington, was one of my favorites in school and helped give me an even greater appreciation for nature. It took nearly 25 years, but I finally got a chance to photograph monarchs in their wintering grounds in Pacific Grove, California — butterflies that were perhaps 100 generations removed from the ones we helped raise.

That winter in California, I found clusters of monarchs so dense they somewhat resembled leaves. Since then, the numbers of butterflies have plummeted, each year reaching a new record low.

Land Almost Lost: Help save these national monuments

I’ll never forget the first time I experienced the feeling of nature lost. Oddly, I was on a hike on a trail that’s one of the more beautiful in the Central Cascades of Washington state.

For a couple of miles, I wandered through forest, catching occasional glimpses of the waterfall that was my destination. And then I came across a giant Western red cedar stump. It was at least three times the diameter of the biggest living trees I had seen along my way.

Horsetail Fall: Spectacular or spectacle?

As the red light of sunset reached the waterfall, applause erupted across the Yosemite Valley. Normally I work in quiet solitude, but this is a special waterfall and it drew an energetic audience of hundreds.

The question is, is that a good thing?

The thrill of the hunt

It may be hard to believe, but there are still a few wondrous places on Earth where animals aren’t afraid of people. With word this week that a hunter with more money than compassion brutally slaughtered a lion from one of these special places, I’m afraid we’re about to lose another.

I’ve never photographed a lion in the wild, but like most nature photographers who’ve ventured very far off the beaten track, I’ve had my share of absolutely magical encounters with wildlife. One that has had a dramatic impact on my view of animals and our relationship with them happened nearly 10 years ago on my first trip to Iceland.

Wow! Is that Niagara Falls?

As I was packing up my camera after photographing from the Canadian side of Niagara Falls, two men came up and asked if they could see what I was shooting. I said, "yes," and pressed the play button on my camera to display the last image I took that morning.

Without asking, one of the men rotated the jog dial on the back of my camera to see the other images I captured that morning. But he rotated it clockwise, and instead of seeing an earlier image, the camera displayed the first image on the memory card — one I took four days earlier.

"Wow!" he exclaimed. "Is that Niagara Falls?"