You can't search using that parameter in the Creatures table, as maturities for each mob are not shown there.
However, you can use the 'Armor vs Mobs' tool (http://www.entropiawiki.com/Chart.aspx?toolid=2), which includes the danger level for each maturity, and sort by that column, which may give the information you're looking for.
Note that you can export that tool to a .csv file to further customise your data manipulation.