The easiest way is to simply enter the search terms in the rectangular search boxes on the Home Page or the Video Page. For example, enter "bison AND fighting" or "prairie" in the search box. However, the latter search is problematic because it will bring up all records with "prairie" including clips of "prairie dogs" or "prairie vole" and shots where "prairie" might be a secondary feature (e.g., the habitat an animal was in). To narrow the search use the multiple-choice boxes in the left column on the Videos Page. For example, under Category select "Landscape > Prairie." Note that within a multiple-choice box the operator is "OR", but between the boxes the operator is a "AND." Lastly, in the single product page (i.e, the page with the large video player) will be a list of keywords associated with that clip at the bottom of the page; click on those keywords to see all clips with that keyword or copy-and-paste the keyword into a search box. In the latter case, you can combine it with other search terms. Feel free to contact us if you need help.