One of the more unusual species found here in Rock Creek Park is the tardigrade, also known as the water bear or the bear of the moss.
These little-known invertebrates are about the size of a pencil dot, so they are best seen under a microscope.
Learn more about tardigrades.
Photograph of tardigrades in one-eighth of a drop of water by David Liittschwager
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Species Count: 277
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