"Oh , okay , I understand it now . I still think it sounds quick but then again , I 'm not a member of the bird family ."
"Also keep in mind that some changes can happen quickly if you select for a quality that 's already present in the population . Something like beak size will following a bell curve . Most beaks close to average size , some larger than average , some smaller . If pressures change so that those with below average beak size gain some advantage than they can exploit it instantly . From the word go they will be eating better and be more healthy than their big beaked cousins , and so more likely to breed successfully come next breeding season . And if the little beakers are the most successful breeders than we would expect to see alot of little beaks in the next generation . Basically , the genetic variety is already present in the population , so exploiting that variety can happen quickly ."
"Oh , okay , I understand it now . I still think it sounds quick but then again , I 'm not a member of the bird family ."
"Also keep in mind that some changes can happen quickly if you select for a quality that 's already present"