´ºË®ÌÃÊÓƵ

Dusky grouse are effectively camouflaged and cryptic much of the year, but when it comes to the spring mating season, the males are bright and bold.

Pence’s religious and political biography mirrors key political and religious shifts over the past 40 years.

Think again.

Stronger Antarctic leadership is urgently needed to safeguard the Southern Ocean—and beyond. Two-thirds of the world’s oceans fall outside national jurisdictions – they belong to no one and everyone. These international waters, known as the high seas, harbour a plethora of natural resources and millions of unique marine species. But...

Evolutionary biologists have found fossil evidence of 110 species of pterosaurs, with wing spans ranging from 10 inches to over 33 feet I scout potential sites for camping and photography trips by looking at maps and reading about landscapes and habitats, so I was optimistic that I had found an...

With dry air and clear skies, people in the west have much greater opportunity to enjoy the light shows at dawn and dusk and celestial phenomena. Following are comments and details, each starting with a question about mechanisms.

New sources ranging from satellites to government records to social media are providing a wealth of opportunities to learn more about wildfire behavior and how it threatens people and affects ecosystems.

Boulder residents were acutely aware of the wildfires, for they had been breathing smoke since the Pine Gulch fire started near Grand Junction on July 31. But the proximity of the CalWood Fire and the sight of roiling smoke rising and forming pyrocumulus clouds at the northern edge of Boulder brought the terrible threat home.

With the setting of the sun and the onset of polar darkness, the Arctic Ocean would normally be crusted with sea ice along the Siberian coast by now. But this year, the water is still open. I’ve watched the region’s transformations since the 1980s as an Arctic climate scientist and,...

A minimum of 21 subspecies have been described, usually geographically separated but sometimes with geographic ranges sharing a border Butterflies flitted among flowers beside South Boulder Creek, in Boulder's greenbelt near the town of Marshall. Common ringlets, Coenonympha tullia , had caught my attention, and I was stalking one, trying...