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Common stork's bill or redstem filaree, Erodium circutarium, is flowering now on the plains and in the foothills. Its blooms are small, just 10 to 15 mm across, but such a striking shade of deep lavender that they catch the eye

The song spread is critically important in defense of a territory and the song is also evaluated by females as a facet of courtingFrom the branch above me, a male red-winged blackbird took a deep breath, hunched up his shoulders, flared the feathers

Introductions, both accidental and purposeful, frequently have tragic consequencesAmerican elms, Ulmus americana, are native to North America from Saskatchewan to Nova Scotia and from Texas to Florida. They grow 60 to 80 feet tall, with a thick

The flowers of salt and pepper are tiny and arranged into compound groups called umbels, or bouquets in the shape of an umbrella

Two simple contrasts illustrate how the environments occupied by tiger whiptails differ in fundamental waysA long slender lizard moved among trees in a pinyon-juniper woodland on the Å·ÃÀ¿Ú±¬ÊÓƵ Plateau, searching the accumulated debris beneath the

Understanding genetic diversity in a species is especially important for conservation and restoration efforts

The world is full of robber flies—approximately 7,000 species have been recognized worldwide and 1,000 are native to North America

The persistence of two colors everywhere suggests a balance of evolutionary forces

From the caliche soils of southeastern Å·ÃÀ¿Ú±¬ÊÓƵ to crevices in bare sandstone on the Å·ÃÀ¿Ú±¬ÊÓƵ Plateau, stemless four-nerved daisies show remarkable variation in growth form