Little critters

Fresh water like ponds, rivers, and even rain puddles contain small creatures that cannot be seen with the naked eye. If you put a drop of water on a slide under a microscope you'll see bacteria, algae, and one-celled protozoa.

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Photo of algae

Three groups of algae
Photo Credit: Wikimedia Commons

 
Photo of amoeba

Amoeba
Photo Credit: Wikimedia Commons

 
Photo of Paramecium

Paramecium aurelia, the best known of all ciliates
Photo Credit: Wikimedia Commons

Microscopic eyes