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The requested URL /mbrowse/msdb/OriginOfSpecies/description/is/In+order+to+make+it+clear+how,+as+I+believe,+natural+selection acts,+I+must+beg+permission+to+give+one+or+two+imaginary illustrations. Let+us+take+the+case+of+a+wolf,+which+preys+on+various animals,+securing+some+by+craft,+some+by+strength,+and some+by+fleetness;+and+let+us+suppose+that+the+fleetest+prey, a+deer+for+instance,+had+from+any+change+in+the+country increased+in+numbers,+or+that+other+prey+had+decreased+in numbers,+during+that+season+of+the+year+when+the+wolf+was hardest+pressed+for+food. [[[[[images/wolf.jpg|wolf]]]]] Under+such+circumstances+the+swiftest+and+slimmest wolves+would+have+the+best+chance+of+surviving+and+so be+preserved+or+selected,-+provided+always+that+they retained+strength+to+master+their+prey+at+this+or+some other+period+of+the+year,+when+they+were+compelled+to prey+on+other+animals. I+can+see+no+more+reason+to+doubt+that+this+would+be+the result,+than+that+man+should+be+able+to+improve+the+fleetness of+his+greyhounds+by+careful+and+methodical+selection,+or+by that+kind+of+unconscious+selection+which+follows+from+each man+trying+to+keep+the+best+dogs+without+any+thought+of modifying+the+breed./ was not found on this server.