Streams and rivers can be either man-made or natural moving water. Their origin can be melting snow, springs or lakes. The temperature, width, plant and animal life vary as the stream or river moves down to its mouth.

Alligator Snapping Turtle Dirty Jobs
Alligator Snapping Turtle Dirty Jobs, YouTube.com, Video length: 01:48.
American Black Duck
American Black Duck, By Lang Elliott, Cornell Lab of Ornithology, Cornell University, Visit the website for photographs, description, and learn about its habitat, behavior, nesting, food habits,
American Mink
American Mink, NatureWorks, New Hampshire Public Television, Image Credits: Clipart.com unless otherwise noted, Visit the website for photos and to learn about its characteristics, range, habita
An Up-Close View of Bristol Bay's Astonishing Sockeye Salmon Runs
An Up-Close View of Bristol Bay's Astonishing Sockeye Salmon Runs, By Jason Ching, E360 Video Contest Award Winner, September 15, 2015, Video Length: 09:50. The first runner-up in the 2015
Beaver
Beaver, NatureWorks, New Hampshire Public Television, Image Credits: Clipart.com unless otherwise noted, Visit the website for photos and to learn about its characteristics, range, habitat, diet
Bob Armebeck's web page on muskrats
Bob Armebeck's web page on muskrats The author of this webpage has numerous photos showing the mounds muskrats built and live in. There's also a video.
Canada Goose
Canada Goose, By Tanya Dewey, Animal Diversity Web, University of Michigan Museum of Zoology, Visit the website for photos (click for enlargement) and to learn about its habitat, lifespan, behav
EEK! Critter Corner, The River Otter
EEK! Critter Corner, The River Otter, Wisconsin Department of Natural Resources, Learn all about the river otter when you visit this website.
Electric eels' secret weapon: Curl before shocking prey
Electric eels' secret weapon: Curl before shocking prey, October 29, 2015, By Lonnie Shekhtman, Staff, The Christian Monitor, Young eels curl into a horseshoe shape to double their shock value w
Explore the riparian forest
Explore the riparian forest, American River Natural History Association, "There are twelve animals in this picture. Can you find them? Click on an animal to learn more about it."
Freshwater Marsh Animal Printouts
Freshwater Marsh Animal Printouts, Enchanted Learning, Labeled illustrations and information for younger students.
Freshwater Mussels, King County,Washington
Freshwater Mussels, King County,Washington, A description and information on its declining numbers, life history, the invading zebra mussel specie, and more.
Frogs Video Clip
Frogs Video Clip Newton's Apple Twin Cities Public Television Visit the web site for the video.
Great Blue Heron
Great Blue Heron, By Robert Naumann, Animal Diversity Web, University of Michigan Museum of Zoology, Visit the website for photos (click for enlargement) and to learn about its habitat, lifespan
Great Blue Heron
Great Blue Heron, NatureWorks, New Hampshire Public Television, Image Credits: Clipart.com unless otherwise noted, Visit the website for photos and to learn about its characteristics, range, hab
Invasive Bullfrogs Done in by Flash Floods
Invasive Bullfrogs Done in by Flash Floods, By Larry O'Hanlon, Fri Aug 13, 2010, Discovery News' Is adaptation the key? Visit the web site for the article.
KDE Santa Barbara - Animals
KDE Santa Barbara - Animals, Photo and information for younger students.
Leech
Leech, Wikipedia.org, Article with images; click for a larger version.
Moose
Moose, NatureWorks, New Hampshire Public Television, Image Credits: Clipart.com unless otherwise noted, Visit the website for photos and to learn about its characteristics, range, habitat, diet,
Muskrat
Muskrat, National Trappers Association, Small photo, description, and information on its reproduction and habits.
Photos of Leeches
Photos of Leeches, By Rhett A. Butler, Mongobay.com, Collection of photos from various places. Click on a photo for a larger version.
Salmon Swim Home Using Earth's Magnetic Field as a GPS
Salmon Swim Home Using Earth's Magnetic Field as a GPS, February 07, 2013, By Marina Koren, Smithsonian Magazine Blog, Read how sockeye salmon use earth's magnetic field to find their birth stre
Small Freshwater Organisms
Small Freshwater Organisms, Giorgio Carboni, December 2006, Fun Science Gallery, Pictures and descriptions of microscopic forms of life found in freshwater ecosystems.
Streams & Rivers, Chesapeake Bay Program
Streams & Rivers, Chesapeake Bay Program, Click on a critter image to learn more about it.
The Secret Life of Plankton
The Secret Life of Plankton, Tierney Thys, Plankton Chronicles Project, Video length: 06:02.
Trout
Trout, From Wikipedia, the free encyclopedia, Article with several images; click for a larger version.
Where do freshwater shrimp live?
Where do freshwater shrimp live? Wiki Answers Visit the web page for the answer.