Library databases are the best place to find scientific journal articles, which are the primary kinds of sources you'll need for your rare species web page. A few that will be particularly helpful to you are listed below.
***In order to gain full access to articles, use the links on this course guide or log in through the AU Libraries website***
These sites have great summary information about basic life history, classification, etc . Most importantly, they include bibliographies where you can find tons more sources (which you can then find in the library catalog).
Same as above - these are great places to find background info and additional sources!