Trying searching a couple different keywords and choose SUBJECTS from the drop down menu. If this is too specific (if you get too few results), just leave the drop down menu alone to its default.
The search below shows that there are 76 peer-reviewed articles in Psych Info about squirrels AND having to do with either "foraging" or "hoarding".
Be sure you utilize the limiters on the RIGHT SIDE of your screen to narrow (or expand) your results.
Click the TITLE of the article in the results list to see more details, such as the SUBJECT HEADINGS associated with a particular article (or book):
See the right hand column for articles similar to the one you are viewing. This helps from having to begin the search again from scratch:
In the Advanced Search feature, limit your results to just the following two sub-databases:
Sort your results by TIMES CITED to see the most impactful (and sometimes controversial) articles:
Gale Virtual Reference Library (GVRL) is great for topic overviews - think of its as the "academic Wikipedia". It's also a great place to locate concise definitions, authored by vetted scholars and authors.