For species 5-year reviews, you will most likely be drawing on different types of material such as published research, conference proceedings, dissertations, data sets, and published government documents: bulletins, reports, reviews, newsletters. You also might draw on sources from unpublished works such as internal government reports, or even correspondence. The bulk of this type of material falls under Grey Literature.
Due to the very nature of grey literature, it can be one of the most challenging to search and find what you're looking for but it is literally everywhere! Luckily, a large portion of documents by government organizations can be easily found using Google Scholar. You can also take advantage of Google's source search which also works well for finding freely available data sets!
Google Scholar
Google Scholar will bring back scholarly and grey literature in your searches such as government or university technical reports, bulletins, and sometimes newsletters. You can adjust the year of publication to bring forward only those that are current or within the timeframe you wish to explore.
Using Google.com to your advantage
Searching basic Google but adding the command site: will allow you to specify the source of your results
- site: .gov will pull results from governmental websites,
- site: .org will pull from organizations*,
- site: .edu will pull from institutions of education.
For example, I might want a fact sheet on the endangered leatherback sea turtle in Georgia. I could search in Google "leatherback sea turtle georgia site:.gov" and expect to find listings from Fish and Wildlife, NOAA or even National Parks System.