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iNaturalist has worldwide observations of biological organisms. You can do a bulk download here. This data is not strictly "open", because login is required. However it is free to register. Use this query to download observations of Suborder Anisoptera (Dragonflies): quality_grade=any&identifications=any&taxon_id=47927 There are currently 357100 ...


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I finally found a good source for this type of data. In the data sets associated with the Pajek Project you can find links to these FoodWeb Datasets. The actual relationships are given by indices, but there is a key for decoding them. For example, in the cypdry.paj file, 15 39 means that Great Blue Herons eat Crayfish. You will have to do some work, but ...


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A lot of formats are actually containers for a specific folder structure. There are some self-contained formats like hdf5, and a lot of zip files around, including different "zip in disguise"(files that use zipping as a container for a specifically organized data structure, often with xml formatted files inside): on top of my head: .dar files for jatsxml ...


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As I already answered on a later question, a list of Medical Imaging datasets can be found on the medical-imaging-datasets repository. Also, it could be interesting to follow both Stephen R. Aylward's list of repositories and the SICAS Medical Image Repository.


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