Thanks for splitting @bouteloua i found a thread traeting the same issue, https://forum.inaturalist.org/t/filter-for-without-field-fieldname/6652 which is linked at @tiwane tutorial https://forum.inaturalist.org/t/how-to-use-inaturalists-search-urls-wiki/63
Perhaps the search feature will be implemented, may be useful in some cases.
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