Beaver dam
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A beaver dam or beaver impoundment is a dam built by beavers; it creates a pond which protects against predators and holds food during winter. These structures modify the natural environment in such a
Beaver dam at Algonquin Park in Ontario, Canada
North American beaver (Castor canadensis), one of two species of beaver
Beaver dam in Lassen Volcanic National Park
Beavers use rocks for their dam when mud and branches are less available as seen on Bear Creek, a tributary to the Truckee River, in Alpine Meadows, California
Wood Buffalo National Park
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Wood Buffalo National Park is the largest national park of Canada at 44,741 km2. It is in northeastern Alberta and the southern Northwest Territories. Larger in area than Switzerland, it is the second
Beaver dam
…in length from a few meters to about 100 metres (328 ft 1 in). Canals can be over 500 metres (1,640 ft 5 in) long. The largest known beaver dam is in Wood Buffalo National Park in Alberta, Canada, and is 775 metres (2,542 ft 8 in) long. Satellite photos provided by NASA WorldWind show the dam did not exist in 1975, but it…
Grosbeak Lake
Plains bison were transferred here from Buffalo National Park in the 1920s, but they carried disease and hybridized with the wood bison, causing their numbers to drop.
Wood bison (not pure)
Marmot