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Sphinx months have an array of identifiers, one being an unusual defense mechanism.

Lingering question: Do variations in scent correspond to variations in color?

With high levels of oxalic acid, like that in Brussels sprouts, and with a proliferation of seed dispersal, the plant easily establishes itself everywhere except Greenland.

Surprisingly, subspecies with different growth forms can be within a few feet of one another.

By rubbing a spear head against stone to form or sharpen it, a groove is gouged very similar to the grooves beside the Procession Panel.

Of the genus Physaria, pretty wildflowers, 24 species grow in Colorado. Ten of 24 species are endemic to Colorado, meaning they live nowhere else.

Full confirmation of this hardy species took five decades of scientific study.

Like other animals, they are marking their territory, and being subtle about it would not serve their purposes.

The stunning flower, seen in Colorado’s high country, might be a distinct species or not; regardless, this is science at work.

In Rabbit Valley near the Colorado-Utah border, some signs indicate that aster could stymie the dominance of the invasive species.