Hello Markus and Daniel, thank you for the fast replies. It's a pity that you had to remove that many records from the backbone. When looking at the occurences, I need to ask two things: a) Are the occurences curated in any form or could they also include pictures showing the wrong species? b) I can only set a maximum limit of 200k on the endpoint Daniel mentioned, so I went on to /occurence/downloads. When I try to send this data via POST (Content-type: application/json): { "creator":"dayzd", "notification_address": ["viper_gx@web.de"], "predicate": { "type":"and", "predicates":[{"type":"equals","key":"class_key","value":"212"},{"type":"equals","key":"media_type","value":"StillImage"}] } } I get a response code of 400. When I leave the content type blank, I'd get a 415. I also tried with the value of "class_key" being an integer, but still no luck. Can you tell me what I'm doing wrong? Greetings, Dayzd