Images

This bighead carp was collected on the Illinois River to learn more about the anatomy and physiology of Asian carp. This information will guide the development of potential biological or chemical controls as part of an integrated pest management approach for natural resource managers.

Contamination from commercial products such as nonstick cookware and stain repellents could reduce the reproduction of tree swallows nesting in Minnesota and Wisconsin.

A researcher stands in front of a large wet slab avalanche debris deposit in Glacier National Park, Montana. The start zone and fracture line can be seen near the top of the ridge in the upper middle part of the image.

Snow removal operators work carefully to remove a large accumulation of avalanche debris on Going-to-the-Sun Road in Glacier National Park, Montana. 

Researchers with the Alaska Fish and Game travel along Alexander Creek in the Susitna Basin of south-central Alaska. The team is on their way to a back country base-camp for a study examining the preferred diet of invasive northern pike (Esox lucius).

Aerial view of backwater habitat for invasive northern pike (Esox lucius) off of Alexander Creek in the Susitna Basin of south-central Alaska.

An Alaska Fish and Game technician poses with an invasive northern pike (Esox lucius) taken from Alexander Creek in the Susitna Basin of south-central Alaska.

U.S. Fish & Wildlife Service employee holds a pallid sturgeon caught on a trotline at Lock and Dam 1 on the Osage River.  The concrete pillars and walls in the background of the photo are what remains of the Lock and Dam 1 structure.   

Radiograph of 3 Belding's Ground Squirrels showing the presence of lead pieces (white flecks in the bodies).

Example of a fish species positively impacted by the hydrologic reconnection of a diked wetland to Lake Erie. Northern Pike depend on productive wetland habitats to spawn.

This adolescent chick, hatched and raised at the USGS Patuxent Wildlife Research Center, is one of ten whooping cranes being released in Louisiana in February 2011. It is a milestone for the state and for the birds, which have not lived in the state since the 1950s.

This adolescent chick, hatched and raised at the USGS Patuxent Wildlife Research Center, is one of ten whooping cranes being released in Louisiana in February 2011. It is a milestone for the state and for the birds, which have not lived in the state since the 1950s.

This adolescent chick, hatched and raised at the USGS Patuxent Wildlife Research Center, is one of ten whooping cranes being released in Louisiana in February 2011. It is a milestone for the state and for the birds, which have not lived in the state since the 1950s.

This adolescent chick, hatched and raised at the USGS Patuxent Wildlife Research Center, is one of ten whooping cranes being released in Louisiana in February 2011. It is a milestone for the state and for the birds, which have not lived in the state since the 1950s.

This adolescent chick, hatched and raised at the USGS Patuxent Wildlife Research Center, is one of ten whooping cranes being released in Louisiana in February 2011. It is a milestone for the state and for the birds, which have not lived in the state since the 1950s.

This adolescent chick, hatched and raised at the USGS Patuxent Wildlife Research Center, is one of ten whooping cranes being released in Louisiana in February 2011. It is a milestone for the state and for the birds, which have not lived in the state since the 1950s.

This adolescent chick, hatched and raised at the USGS Patuxent Wildlife Research Center, is one of ten whooping cranes being released in Louisiana in February 2011. It is a milestone for the state and for the birds, which have not lived in the state since the 1950s.

Boa constrictor "in situ" on a tree buttress right after some rain in Puerto Rico.

The carcass of a red-winged blackbird from Beebe, AR is being examined by USGS National Wildlife Health Center wildlife pathologist Dr. David E. Green.

The carcass of a red-winged blackbird from Beebe, AR is being examined by USGS National Wildlife Health Center wildlife pathologist Dr. David E. Green.

The carcass of a red-winged blackbird from Beebe, AR is being examined by USGS National Wildlife Health Center wildlife pathologist Dr. David E. Green.