Images

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

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.

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.

This seven- to eight-week-old osprey fledgling was photographed in a nest at Poplar Island, Maryland. The island in Chesapeake Bay was used as a control site, where toxic chemical residues were low, in a USGS study of chemical contaminants in Bay ospreys’ food chain.

Gulls, such as this Iceland gull, play an important role in moving avian flu viruses across the North Atlantic between Europe and North America.

Gulls, such as this lesser black-backed gull, play an important role in moving avian flu viruses across the North Atlantic between Europe and North America.

Line of bull elk moving across field with snow-covered Wyoming hills in the background.