Rivers and streams, burns, brooks and springs – the names are varied but the flora and fauna all have to cope with the same thing: water that flows continuously in one direction. If you live here you need a way to avoid being washed downstream and ultimately into the sea. Plants and animals have to be able to cling on, hide away from the flow or swim against the current.
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Lotus blooms
A touch of the Orient in the Caspian Sea.
A touch of the Orient in the Caspian Sea.
The right way
New Zealand's wrybill uses its unique beak to probe under stones.
New Zealand's wrybill uses its unique beak to probe under stones.
Sheffield river life
The changing nature of urban rivers.
The changing nature of urban rivers.
Flourishing otters
Mike Dilger finds that otters are becoming more common in the UK.
Mike Dilger finds that otters are becoming more common in the UK.
Amazon source
Torrent ducks dabble in the vital fresh water that runs from Peru's moors.
Torrent ducks dabble in the vital fresh water that runs from Peru's moors.
Platypus
Daubenton's bat
Greater bulldog bat
American mink
Baikal seal
Common seal
Giant river otter
North American river otter
Otter
Polecat
Amazonian manatee
Hippopotamus
Water buffalo
Beavers
European beaver
European water vole
North American beaver
Star-nosed mole
Amazon river dolphin
Common bottlenose dolphin
Harbour porpoise
Indo-Pacific bottlenose dolphin
Black-throated diver
Great northern diver
Barnacle goose
Bewick's swan
Goldeneye
Mallard
Mandarin duck
Mute swan
Swans
Whooper swan
African fish eagle
Osprey
Steller's sea eagle
White-tailed sea eagle
Common crane
Common moorhen
Coot
Coots, cranes and rails
Demoiselle crane
Kingfisher
Pied kingfisher
Dipper
Grey wagtail
Reed warbler
Sedge warbler
Oystercatcher
Grey heron
Herons, egrets and bitterns
Little egret
Wood stork
American crocodile
Caiman
Chinese alligator
Crocodiles
Gharial
Nile crocodile
Siamese crocodile
Spectacled caiman
Yacare caiman
Boa constrictor
Grass snake
Water monitor
Yellow anaconda
Giant river turtle
Darwin's frog
Ditch frogs
Marsh frog
Mountain chicken
Smoky jungle frog
Surinam toad
Chinese giant salamander
Japanese giant salamander
Texas blind salamander
Ray-finned fishes
Brycons
Characids
Red-bellied piranha
Tambaqui
Three-spined stickleback
Pirarucu
Atlantic salmon
Atlantic salmon and trout
Brown trout
Salmon family
Sockeye salmon
Candirus
Catfish
Eeltail catfish
Herring and sardine family
Gobies
Perch-like fishes
Great diving beetle
Banded demoiselle
Damselflies and dragonflies
Dragonflies
Highland midge
Mayflies
Tisza mayfly
A river is a natural watercourse, usually freshwater, flowing towards an ocean, a lake, a sea, or another river. In a few cases, a river simply flows into the ground or dries up completely before reaching another body of water. Small rivers may also be called by several other names, including stream, creek, brook, rivulet, tributary and rill. There are no official definitions for generic terms, such as river, as applied to geographic features, although in some countries or communities a stream may be defined by its size. Many names for small rivers are specific to geographic location; one example is "burn" in Scotland and northeast England. Sometimes a river is said to be larger than a creek, but this is not always the case, because of vagueness in the language.
Rivers are part of the hydrological cycle. Water within a river is generally collected from precipitation through a drainage basin from surface runoff and other sources such as groundwater recharge, springs, and the release of stored water in natural ice and snowpacks (e.g., from glaciers). Potamology is the scientific study of rivers.
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