Macroinvertebrates

Under the water of many lakes and streams is the amazing world of the macroinvertebrate (MAC-row-in-VERT-ih-brate). Macroinvertebrates are often called macros. They are invertebrates (animals without a backbone) that you can see without using a microscope or magnifying glass. Slimy snails are macros, and so are crawly crayfish.