When looking for women at the bar it is helpful to identify "The Last Rhino" in every group. Then you can strategically hit on them if closing time is drawing near and your hunting has been plagued by failure and or cockblockers. The herd will usually sacrafice its "Last Rhino" to save themselves.
Not necessarily indicative of size or appearance. Last Rhinos aren't always fat or unattractive, even in a group of hott chicks there is an easy target, she is "The Last Rhino"
Gentlemen, last night was a success, The Last Rhino never saw me coming.