Yes it is possible to clean out your local population, but that is really a form of cheating (stats manipulation). Instead, practice your creatures in offline Terrarium mode, or point the client at the Training server to get practice in a controlled environment.
See this thread for more details on the Training server:
<a href="http://www.windowsforms.net/Forums/ShowPost.aspx?tabIndex=1&tabId=41&PostID=17083">http://www.windowsforms.net/Forums/ShowPost.aspx?tabIndex=1&tabId=41&PostID=17083</a>
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