Obviously, fish are most at risk in conditions where the water level is falling. While most fish take cues from the water level and move down stream or find pools in which to survive, some such as the catfish or lungfish, have the ability to survive for long periods in merely damp, muddy pools. Other organisms such as frogs and salamanders can do the same, as long as they can maintain the layer of slime on their bodies. Reptiles such as turtles and snakes can survive for long periods without water and often spend dry winters in reptilian hibernation, only awakening once the spring temperatures and showers replenish the streams and rivers.
Seasonal, intermittent and irregular rivers and streams are fascinating habitats which support highly specialized animals in many different ways, and should be investigated closely to be appreciated.
African clawless otter
Cameroon clawless otter
North american otter
La plata otter
Indian smooth-coated otter
Giant brazilian otter
African wading rat
Greater cane rat
Dugongs, manatees, and sea cows
Read more at the list of biomes of the world...