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 , <WSD>Brooding</WSD> , Hatching , and Birth ) , the latter on a `` normal '' newly born individual . 
Meaning of the word marked with <WSD> tags:  sitting on eggs so as to hatch them by the warmth of the body