I am always amazed at the plethora of great databases on the ‘net. While many of them require a subscription or membership of some sort, more and more of them are FREE.
PubMed Central: PMC is a free full-text archive of biomedical and life sciences journal literature at the U.S. National Institutes of Health’s National Library of Medicine (NIH/NLM).such as this research on growing mushrooms on agricultural waste.
Global Biodiversity Information Facility: GBIF database with free and open access to biodiversity data.
University of Missouri Extension: Did you know that “…ragweed is undoubtedly among the most important foods of bobwhites” (source), that “At least one researcher has found giant ragweed to contain more metabolizable energy by weight than corn” (source), and that “Pigweeds produce many seeds, which despite their small size, are regularly and abundantly consumed by bobwhites” (source). This information comes from the site’s natural resources-wildlife-conservation section, in an article entitled Quail-friendly Plants of the Midwest.