'This was hanging on the bottom of a floating island,' the group said of the unusual discovery, made earlier this month.
'The big bag is formed by several animals together. At a certain point they form a colony and different colonies can then stick together again,' urban ecologist Anne Nijs said.
'But fortunately they do not harm the environment here,' she added.
'It is the first time that they have been discovered here. So it is a very special story,' Nijs told Dutch news site AD.
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