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Benson Nature Group undertakes regular surveys of the river fly population in the Brook. Below is a graph showing the river fly population over the last 4 years. Further data can be found by selecting an option from the "Surveys" menu.
![river fly[2161].jpg](https://static.wixstatic.com/media/661674_f4ef2ebed61f4fcf9b3365a3cf329b3d~mv2.jpg/v1/fill/w_977,h_327,al_c,q_80,usm_0.66_1.00_0.01,enc_auto/river%20fly%5B2161%5D.jpg)
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