Early amphibians were the first animals to leave the sea and venture onto land, forming a key evolutionary bridge from fish to terrestrial reptiles. A class of animals that includes frogs, toads, and salamanders, amphibians are indicator species — that is, the health of a region’s amphibian population indicates the health of the ecosystem in general. In recent decades there has been a dramatic decline in amphibian populations around the globe.

Canyon Tree Frog

Posted by andrea - February 11, 2009 - Amphibians

The canyon tree frog inhabits the Colorado Plateau’s river corridors, where uranium mining tailings threaten water quality, oil and gas drilling activity disturbs sensitive habitat, and dams and other water projects divert the flows that species depend on for survival.

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Northern Leopard Frog

Posted by Josh Pollock - August 10, 2006 - Amphibians

Like most amphibian species in North America, the northern leopard frog is suffering from the effects of habitat loss, pollution, and disease. Its populations across the western U.S. have declined drastically.

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Boreal Toad

Posted by Megan Mueller - May 11, 2006 - Amphibians

The boreal toad of the southern Rocky Mountains inhabits high elevation montane forests and is Colorado’s only high elevation forest dwelling amphibian.

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