Drought and beetle-killed piñon pines in Walnut Canyon National Monument near Flagstaff, Arizona, amid a few surviving trees. Forest drought stress is strongly correlated with tree mortality from poor growth, bark beetle outbreaks, and high-severity fire.
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Drought and Beetle-Killed Piñon Pines in Arizona
Drought and beetle-killed piñon pines in Walnut Canyon National Monument near Flagstaff, Arizona, amid a few surviving trees. Forest drought stress is strongly correlated with tree mortality from poor growth, bark beetle outbreaks, and high-severity fire.
Bobcat Tracking
A Vermont Unit researcher outfits a captured bobcat with a lightweight GPS collar that will record its daily movements.The collar will provide information on bobcat home range size, habitat use, and movements.
A Vermont Unit researcher outfits a captured bobcat with a lightweight GPS collar that will record its daily movements.The collar will provide information on bobcat home range size, habitat use, and movements.
Bobcat Tracking
A Vermont Unit researcher outfits a captured bobcat with a lightweight GPS collar that will record its daily movements.The collar will provide information on bobcat home range size, habitat use, and movements.
A Vermont Unit researcher outfits a captured bobcat with a lightweight GPS collar that will record its daily movements.The collar will provide information on bobcat home range size, habitat use, and movements.
A Hermit Thrush on the Nest in Arizona
Hermit thrushes are a songbird species that was strongly affected by plant community changes in mountains because of reduced snowpack and cascading ecological effects, according to a USGS Montana Cooperative Wildlife Research Unit study.
Hermit thrushes are a songbird species that was strongly affected by plant community changes in mountains because of reduced snowpack and cascading ecological effects, according to a USGS Montana Cooperative Wildlife Research Unit study.
Acadia Waterfall
Hadlock Brook, in Acadia National Park, is a small watershed that was monitored by the USGS from 1999 to 2006. The Hadlock Falls is a popular spot for a break on one of the many scenic trails through the park. The USGS gaging station was approximately 100 ft above the falls.
Hadlock Brook, in Acadia National Park, is a small watershed that was monitored by the USGS from 1999 to 2006. The Hadlock Falls is a popular spot for a break on one of the many scenic trails through the park. The USGS gaging station was approximately 100 ft above the falls.
Lake Lundy
A mountain lake (Lundy Lake) taken in the Central Basin and Range Ecoregion (NV) in May 2005.
A mountain lake (Lundy Lake) taken in the Central Basin and Range Ecoregion (NV) in May 2005.
Moving Shadows
Picture of a hydrographer's shadow as flood water is measured from a cablecar.
Picture of a hydrographer's shadow as flood water is measured from a cablecar.
Afghanistan's Colorful Mountain Ranges
Colorful mountains of Sar-e-Pul hint of copper (green) and iron (red).
Colorful mountains of Sar-e-Pul hint of copper (green) and iron (red).
Butterfly Specimen Souveniors
Pinned butterfly specimens sold as souveniors in a market.
Pinned butterfly specimens sold as souveniors in a market.
Butterfly and Spider Specimen Souveniors
Pinned butterfly specimens and a spider sold as souveniors in a market.
Pinned butterfly specimens and a spider sold as souveniors in a market.
Butterfly and Spider Specimen Souveniors
Pinned butterfly specimens and a spider sold as souveniors in a market.
Pinned butterfly specimens and a spider sold as souveniors in a market.
Butterfly and spider specimen souveniors
Pinned butterfly specimens and a spider sold as souveniors in a market.
Pinned butterfly specimens and a spider sold as souveniors in a market.
Butterfly specimen souveniors
Pinned butterfly specimens sold as souveniors in a market.
Pinned butterfly specimens sold as souveniors in a market.
Butterfly and spider specimen souveniors
Pinned butterfly specimens and a spider sold as souveniors in a market.
Pinned butterfly specimens and a spider sold as souveniors in a market.
Enchanted Rock, Texas
Enchanted Rock is a granite formation from the Precambrian age
Enchanted Rock is a granite formation from the Precambrian age
Acadia National Park
Scenic view of a tree on coastal rocks by shore line.
Scenic view of a tree on coastal rocks by shore line.
Acadia National Park
Coastal view showing rocks and coast line.
Coastal view showing rocks and coast line.
Acadia National Park
Shoreline view with snow-topped mountains in background.
Shoreline view with snow-topped mountains in background.
Acadia National Park
Inlet with sandy shore and coastal rock forms.
Inlet with sandy shore and coastal rock forms.
Acadia National Park
Waves crashing against rocky shoreline.
Waves crashing against rocky shoreline.
Acadia National Park
Shoreline seen through trees with hills in background.
Shoreline seen through trees with hills in background.