Unidentified growth on the roots of the reed roots. Possibly sponge, family Spongillidae, or Hydra-like creatures. To be verified. Lake Jezioro Czarnoglowy, Oder Delta water catchment, Poland.

The Oder Delta is located in the Baltic coast in Germany and Poland. The Oder Delta is a European Rewilding area since June 2015, and the region is unique with a rich mosaic of large wild freshwater and marine ecosystems. It is strategically located on one of the ecological crossroads in Europe.The wild jigsaw of habitats includes rivers, heathlands, deltas, marshes, vast reed beds, forests, wild grasslands and bogs. IThe Oder Delta is rich in biodiversity as well as biomass.