Similar to https://forum.inaturalist.org/t/cannot-fetch-pages-beyond-333/3861, there’s a 10k limit to how many results can be returned by a search. We could do a better job by catching the error and presenting an understandable error message, but the limit is why it’s happening. I suggest adding more search parameters to reduce the result set. You can also try exporting the observations to access results up to 200k
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