In a popualation where ther is a range of fur lengths...
The original temperature of the enviroment is 10 degrees. The mean fur length is 15mm.
If the temperature falls, individuals with longer fur (to the right of the mean) will be favoured for, whilst those with shorter fur (to the left of the mean) are favoured against.
Over many generations, the mean fur length increases as individuals who posses long fur phenotypes are surviving and reproducing. Those with shorter fur do not reproduce as successfully as they either die or are not healthy enough.
The mean fur length continues to shift till the optimum is reached for the lower temperature.
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