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A mating wheel allows a precise comparison of the colors and patterns of males and femalesThe little marsh swarmed with insects. Tiny moths popped up from the grass, darted a short distance and then disappeared back into the grass. Small wood nymph

Because billions of birds migrate in North America, this asynchrony of needs and availability of resources could become a widespread problem.

Wild or free roaming burros and horses are protected by Federal Law as "living symbols of the historic and pioneer spirit of the West.”A few miles south of the historic swinging bridge crossing the San Rafael River, a group of 10 burrows grazed on a

Social systems of great blue herons vary dramatically, from solitary nests to large heronries, and some heronries include nests of great egrets and cattle egrets.

The sharing of vigilance and alarms by golden-mantled ground squirrels and yellow-bellied marmots is not unique.

Great egrets usually hunt in shallow water, stalking small fish, which they swallow whole.

An understated characterization of quaking aspen is that it grows in many different plant communities, in many different ways and has adapted to an extremely wide range of environments.

Trilobite beetles are perhaps the most bizarre of all the net-winged beetlesSome insects are cryptic, blending in with their backgrounds to hide from predators, while others are brightly colored, noisy, or form dense and conspicuous aggregations to

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.

Evolutionary biologists have found fossil evidence of 110 species of pterosaurs, with wing spans ranging from 10 inches to over 33 feetI scout potential sites for camping and photography trips by looking at maps and reading about landscapes and