see https://forum.inaturalist.org/t/add-feeds-showing-when-new-species-are-added-to-the-database/48405/3
here’s an example that allows me to look for newly identified stuff in my area: https://jumear.github.io/stirfry/iNatAPIv1_identifications_recent_taxa.html?place_id=110679&quality_grade=needs_id,research&rank=species&category=improving,leading&per_page=200
some related discussion: https://forum.inaturalist.org/t/show-number-of-reviewers-for-an-observation/38623