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A female Callibaetis mayfly from Millbrook Marsh.

Aquatic invertebrates are animals without backbones that live in water. Invertebrates that are too small to be seen with the naked eye are “microinvertebrates,” while those that can be seen without the help of a microsco...

Among all the invertebrates in Spring Creek, crayfish probably have the most profound effect on the ecology of the stream, yet they are among the least noticed.  During the day, you can carefully observe a small area of stream bottom and never see a single crayfish.  I...

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