Silhouette Images Contributed by Nathan Jay Baker

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16 silhouette images in all.

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Dreissena polymorphaDreissena polymorphaSimulium damnosumNeogobius melanostomusPerccottus gleniiPseudorasbora parvaNeogobius fluviatilisProdiamesa olivaceaEphemera danicaAphelocheirus aestivalisHydropsyche siltalaiOrectochilus villosusEiseniella tetraedraBaetis rhodaniAncylus fluviatilisGammarus roeselii