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A great blue heron hangs out on the floating oyster cages at Horn Point Laboratory. — Great Blue Heron (Ardea herodias) on Oyster Cages

Ardea herodias (Great Blue Heron) 2

Beautiful Great Egret in a large tree. — Ardea modesta (Eastern Great Egret) in tree

Rack focus on a great blue heron between a bed of Tiger lillies. — Ardea herodias (Great Blue Heron) in Lilium…

close up on a great horned owl. — Bubo virginianus (Great Horned Owl) in captivity

Short clip of two White Pelicans while a Great Blue Heron stalks fish in the background — Pelecanus erythrorhynchos and Ardea herodias…

Great Blue Heron hunting in shallow water. — Ardea herodias (Great Blue Heron) in shallow water

Great footage of a great blue heron hunting in shallow waters along the side of a road. — Ardea herodias (Great Blue Heron) hunting in marsh

Great egret taking flight over a calm marsh. — Egretta thula (Great Egret) flying over marsh

Great egret hunting in a shallow marsh for an evening meal. — Egretta thula (Great Egret) in shallow marsh

This three panel triptych illustrates historical, predevelopment conditions in the North Central United States, in comparison to the current state, and future trajectory of land and water use. Historically, the region adapted and rebounded from droughts, however, with human use and climate change, the resilience of the North Central United States against drought is reaching an unknown state. — Historical, predevelopment conditions in the…

Esox lucius (Northern Pike)

Freight: lake freighter

The Northern Great Plains Network consists of 13 park units located in the Dakotas, Nebraska and eastern Wyoming. This network consists of 11 ecoregions. — Northern Great Plains Network National Park…

Some of the most common threats to the national parks ecosystems include those to quality of air, quality and quantity of available water, and the parks native species. Prescribed fire is used to prevent uncontrolled forest fires and to reduce the growth of nonnative species. — Generic Resources and Threats to the Northern…

While Jewel Cave is currently in pristine condition there are several threats that could potential damage this site. These threats include the pollution of ground water that seeps into the cave at various points and visitor impacts. — Jewel Cave National Monument Threats and Features

The Niobrara River is where six major biomes converge to form a rich diversity of flora and fauna. Threats to the river arise from fire exclusion leading to the expansion of ponderosa pine into grassland area, changes in microclimates, the spread of invasive plants and the high volume of visitors during peak periods. — Niobrara National Scenic River Resources and…

Great blue heron in the Everglades at Shark Valley Visitor Center. — Great blue heron

Great blue heron in the Everglades at Shark Valley Visitor Center. — Great blue heron in the Everglades

After tropical Storm Irene, trash, mud, and logs washed into the bay. — Affects of tropical storm Irene

Ardea Herodias (Great Blue Heron)

Diagram showing key features of and major threats to the Great Barrier Reef. — Diagram showing key features of and major threats…

Streamflow was high during March in the Great Smoky Mountains National Park en route to Ramsey Cascades — Great Smoky Mountain National Park

Heavy flow in a rocky stream — Great Smoky Mountain National Park

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