if you need basically same the information that shows up on the taxon page seasonality graphs, you can get this from the API via /v1/observations/popular_field_values. it’s a little more efficient than getting that information /v1/observations/histogram, although /histogram will allow you to specify a few more options when retrieving data. see https://forum.inaturalist.org/t/plant-phenology-graph-data/31862/2 for more information.
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