1) Encyclopedia of Life (EOL), provide information of biotic association from general sources like Wikipedia, NatureServe, but also more specific like North American Butterfly Knowledge Network or Barcode of Life.
2) Biodiversity Heritage Library (BHL), provide digitalized literature of biodiversity mostly ancient publications.
3) Global Biodiversity Information Facility (GBIF), provide distribution records with different accuracy from country, province or ecoregion names, to point localities.