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The article discusses a study by evolutionary morphologist Tom Geerinckx at Ghent University in Belgium who discovered that the teeth of suckermouth catfish (Loricariidae) bend to avoid being broken or chipped when feeding.

The article discusses the uses of and the animals that inhabit freshwater. Some freshwater animals are river otter, armored catfish, male platypuses, snake-necked turtles and minnows. About 430 dams in the U.S. have been removed since 1999 to allow rivers to return to their natural flow. The world's longest river, the Nile stretches about 4,000 miles which is equivalent to over 42 million dollar bills lined up end to end.