“Earthworms are great for soil. They speed up decomposition by consuming lots of dead plant material, and their burrows help aerate the soil and let water through easily. Worm casts (faeces) are rich in recycled plant nutrients that help to maintain soil fertility.”
There are different ways of obtaining worms to identify. You can hand search by moving leaves, logs and other ground cover, dig out a section of soil
and search for worms
or you can mix a solution of water and mustard and pour onto a metre square of ground
and as the mustard solution is a mild irritant, the worms will come to the surface.
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Once you have your specimens you use a magnifying glass and the identification key to identify each species.