Sentence:  The range is from 14 to 25 inches ; the former figure is based on a somewhat unusual birth of four by a Central American female ( see chapter on Laying , Brooding , Hatching , and Birth ) , the latter on a `` <WSD>normal</WSD> '' newly born individual . 
Meaning of the word marked with <WSD> tags:  conforming with or constituting a norm or standard or level or type or social norm; not abnormal