Images

Marc Blouin, NBS Research Biologist, uses an electrofishing boat to obtain information on fish populations in the Black River in Lorain, Ohio.

Biologists inspect fish catch from trawl net.

From the U.S. Geological Survey Photographic Library, No. 2011DENPH0239, folder 3, Field Surveys - Antarctica. It was taken during the U. S. Geological Survey Byrd Land Survey Traverse, United States Antarctic Research Program, 1966-67.

A threatened Louisiana black bear and her cubs up in a tree.

USGS researcher Rebecca Lazarus prepares to take a blood sample from an osprey fledgling in a nest on the Chesapeake and Delaware Canal, Delaware Bay in 2015. Lazarus and colleagues did similar sampling of 48 chicks on Chesapeake Bay in 2011-2013.

Arizona saquaro will be one of the species looked at by USA-NPN volunteers.

Steve Nagel collects data from a weather station in the Shenandoah National Park.

Little blue herons are a species recorded in the historical bird phenology cards.

Balkan endemic nephropathy (BEN) patient from a BEN village in Romania. The photo was taken at a dialysis clinic in Romania where the patient traveled every 2 to 3 days to receive dialysis, the principal treatment option for people with BEN. This patient died from complications of BEN within a year after this photo was taken in 2000.

Nikola Pavlovic, a kidney specialist and a USGS collaborator on Balkan endemic nephropathy (BEN) studies from Serbia, is shown exposing a small Pliocene lignite bed near a BEN village in the Vratza area of Bulgaria. The Pliocene lignite seams vary greatly in size and extent. BEN villages are always close to these Pliocene lignite deposits.

Deschauensee's Anaconda (Eunectes deschauenseei). The snake pictured is a representative of a species discussed in the USGS snake risk assessment. This snake was photographed in its native range.

Brutus, a wolf being studied by USGS scientists, separates from his pack mates and appears to be heading back to the den. He stops at the head of the fiord and howls for 2-3 minutes. The scientists track his progress with binoculars past the river where they cannot go. They suspect that his mate has returned to the den, and that Brutus will join her there.

Brutus, a wolf being studied by USGS scientists, is chemically immobilized, measured, ear-tagged, and fitted with a radio collar near the Eureka airstrip on Ellesmere Island in the High Arctic, Nunavut, Canada.

Massachusetts inner continental shelf bottom photograph showing seafloor life.

An American Alligator in Everglades National Park. The species was once listed as Endangered, but was removed in 1987 after a successful recovery.

American crocodiles are restricted in their range within the USA to southern Florida. Decisions on restoration of the Everglades must incorporate protection for this threatened species.

Collecting sediment to look for evidence of forage fish (sand lance and/or surf smelt) spawning (eggs) in Liberty Bay - Puget Sound.

Coast Salish Canoe Journey 2009 landing in Pillar Point.
The journey pulled a water quality probe to measure salinity, temperature, pH, and dissolved oxygen.

Frog in the woods in Shenandoah National Park, Virginia.

A prairie wetland at Ordway Prairie near Aberdeen, South Dakota.

USGS microbiologist Maren Tuttle counts hatched northern pike fry.