Unio crassus, the thick shelled river mussel, singing birds

Unio crassus, the thick shelled river mussel, is a species of freshwater mussel, an aquatic bivalve mollusk in the family Unionidae, the river mussels.

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There are hundreds of river barriers all around Europe which are not yet mapped and are waiting to be recorded. It is necessary to remove these barriers to return rivers to their natural, free-flowing state.

https://damremoval.eu/

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