A beautiful male swallowtail butterfly.

The Darwin Award goes to a male black swallowtail butterfly

Jan. 5, 2023

The beautiful male emerged in October, eager to mate but destined for disappointment because he emerged too late in the season, just an example of natural selection at work I received an invitation to photograph a black swallowtail butterfly that had just emerged. It would linger only a short while...

aspen

Mysterious lumps and swollen bands on aspen

Dec. 9, 2022

One puzzle leads to another question, as yet unanswered, about the cause.

dam

Beavers have become established in Boulder Canyon

Nov. 23, 2022

Beavers may appear to be one of the most sedentary of species, living in a secure den or lodge in a pond with all of their food within a short waddle, but now, in Boulder Canyon and in Alaska, it is evident that they are on the move.

temple sun

Saltbush evolved to filter dust from wind to form mounds

Sept. 28, 2022

The wind that sculpts the stones also conspires with plants to transform a valley floor to a landscape of mounds with embedded plants.

moth

Achemon sphinx moths' range is shrinking

Aug. 9, 2022

No doubt about it, sphinx moths are extraordinary; extinction is forever, and it would be tragic to lose such a remarkable group of moths.

paintbrush

Downy paintedcup adapts to changes in pollinators and root hosts across its range

July 8, 2022

The communities of pollinators and potential root hosts respond to climate change and the ever-increasing impact of humans on natural habitats.

ruddy

Ruddy copper butterflies are sexually dimorphic for color and color vision

Feb. 2, 2022

It seems that reproductive success and sexual dimorphisms for dorsal color and for vision are inexorably interdependent in ruddy copper butterflies.

solstice

Winter solstice dawn from Flagstaff Mountain amphitheater

Jan. 5, 2022

My viewing of winter solstice dawn was quiet, but I had the conviction that this sort of observation reached far back into history, all around the world.

dead tree

A forensic analysis of a dead ponderosa pine

Dec. 19, 2021

Why did that one tree die? An expert is on the case.

cattails

Cattails are on the move in North America

Dec. 7, 2021

Invasive propensities of the various species are enhanced and more successful in disturbed environments. Consequently, both native and introduced cattails are expanding their ranges.

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