This image was taken during field tests to determine the effectiveness of a USGS-developed oral sylvatic plague vaccine (SPV) to help immunize prairie dogs against plague. The SPV is administered to wild prairie dogs via a brightly colored bait.
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Normal Versus Bait-Laden Prairie Dog Feces
This image was taken during field tests to determine the effectiveness of a USGS-developed oral sylvatic plague vaccine (SPV) to help immunize prairie dogs against plague. The SPV is administered to wild prairie dogs via a brightly colored bait.
Pitchfork Ranch, Wyoming
Over 30 organizations and agencies are testing a USGS-developed oral sylvatic plague vaccine (SPV) at sites such as the Pitchfork Ranch in Wyoming, pictured here. If successful, the SPV could help protect endangered black-footed ferret populations in the western
Over 30 organizations and agencies are testing a USGS-developed oral sylvatic plague vaccine (SPV) at sites such as the Pitchfork Ranch in Wyoming, pictured here. If successful, the SPV could help protect endangered black-footed ferret populations in the western
Bait-Colored Prairie Dog Excrement
This image was taken during field tests to determine the effectiveness of a USGS-developed oral sylvatic plague vaccine (SPV) to help immunize prairie dogs against plague. The SPV is administered to wild prairie dogs via a brightly colored bait.
This image was taken during field tests to determine the effectiveness of a USGS-developed oral sylvatic plague vaccine (SPV) to help immunize prairie dogs against plague. The SPV is administered to wild prairie dogs via a brightly colored bait.
Prairie Dog Hole, Pitchfork Ranch, WY
The image was taken during field tests to determine the effectiveness of a USGS-developed oral sylvatic plague vaccine (SPV) to help immunize prairie dogs against plague. The SPV is administered to wild prairie dogs via a brightly colored bait.
The image was taken during field tests to determine the effectiveness of a USGS-developed oral sylvatic plague vaccine (SPV) to help immunize prairie dogs against plague. The SPV is administered to wild prairie dogs via a brightly colored bait.
Cages Next to Prairie Dog Hole
Cages are set up next to a prairie dog burrow at the Pitchfork Ranch in Wyoming to capture free-ranging prairie dogs. Once captured, each trapped prairie dog is tagged, and a scientist takes hair, whisker, and blood samples before the animals are released back into the wild.
Cages are set up next to a prairie dog burrow at the Pitchfork Ranch in Wyoming to capture free-ranging prairie dogs. Once captured, each trapped prairie dog is tagged, and a scientist takes hair, whisker, and blood samples before the animals are released back into the wild.
Cattails on the Cuyahoga
The Cuyahoga Valley National Park stretches along the Cuyahoga River between Cleveland and Akron in Ohio.
The Cuyahoga Valley National Park stretches along the Cuyahoga River between Cleveland and Akron in Ohio.
I-80 over the Cuyahoga
The Cuyahoga Valley National Park stretches along the Cuyahoga River between Cleveland and Akron in Ohio. It is crossed by Interstate 80.
The Cuyahoga Valley National Park stretches along the Cuyahoga River between Cleveland and Akron in Ohio. It is crossed by Interstate 80.
Cuyahoga Valley Scenic Railroad
The Cuyahoga Valley National Park stretches along the Cuyahoga River between Cleveland and Akron in Ohio. It preserves the river ecology of the Cuyahoga River as well as historic transportation routes, such as the Cuyahoga Canal Towpath and the Cuyahoga Valley Scenic Railroad.
The Cuyahoga Valley National Park stretches along the Cuyahoga River between Cleveland and Akron in Ohio. It preserves the river ecology of the Cuyahoga River as well as historic transportation routes, such as the Cuyahoga Canal Towpath and the Cuyahoga Valley Scenic Railroad.
I-80 over the Cuyahoga
The Cuyahoga Valley National Park stretches along the Cuyahoga River between Cleveland and Akron in Ohio. It is crossed by Interstate 80.
The Cuyahoga Valley National Park stretches along the Cuyahoga River between Cleveland and Akron in Ohio. It is crossed by Interstate 80.
Cuyahoga River
The Cuyahoga Valley National Park stretches along the Cuyahoga River between Cleveland and Akron in Ohio.
The Cuyahoga Valley National Park stretches along the Cuyahoga River between Cleveland and Akron in Ohio.
Cattails on the Cuyahoga
The Cuyahoga Valley National Park stretches along the Cuyahoga River between Cleveland and Akron in Ohio.
The Cuyahoga Valley National Park stretches along the Cuyahoga River between Cleveland and Akron in Ohio.
American Falls
A view of American Falls from the United States side of Niagara Falls.
A view of American Falls from the United States side of Niagara Falls.
Sediment Plume downstream of Niagara Falls
A natural plume of dissolved sediments just downstream from Niagara Falls. As water travels through rock and soil, it dissolves sediments. This plume then emerges downstream from the main falls.
A natural plume of dissolved sediments just downstream from Niagara Falls. As water travels through rock and soil, it dissolves sediments. This plume then emerges downstream from the main falls.
American and Horseshoe Falls in Niagara Falls
A view of American (left) and Horseshoe Falls in Niagara Falls from the Canadian side of the falls.
A view of American (left) and Horseshoe Falls in Niagara Falls from the Canadian side of the falls.
Horseshoe Falls
A view of Horseshoe Falls from the Canadian side of Niagara Falls.
A view of Horseshoe Falls from the Canadian side of Niagara Falls.
American Falls
A view of American Falls from the Canadian side of Niagara Falls.
A view of American Falls from the Canadian side of Niagara Falls.
Panorama of American and Horseshoe Falls in Niagara Falls
Panorama of American and Horseshoe Falls in Niagara FallsA panorama of American and Horseshoe Falls in Niagara Falls from the Canadian side of the waterfall.
Panorama of American and Horseshoe Falls in Niagara Falls
Panorama of American and Horseshoe Falls in Niagara FallsA panorama of American and Horseshoe Falls in Niagara Falls from the Canadian side of the waterfall.
International Border at Niagara Falls
The international border at Niagara Falls.
The international border at Niagara Falls.
American and Horseshoe Falls in Niagara Falls
A view of American (left) and Horseshoe Falls in Niagara Falls from the Canadian side of the falls.
A view of American (left) and Horseshoe Falls in Niagara Falls from the Canadian side of the falls.
Horseshoe Falls
A view of Horseshoe Falls from the Canadian side of Niagara Falls.
A view of Horseshoe Falls from the Canadian side of Niagara Falls.
Niagara River Rapids
A view of rapids on the Niagara River, just upstream of American Falls.
A view of rapids on the Niagara River, just upstream of American Falls.