ובמלאות ימי טהרה ... תביא כבש בן שנתו לעולה ובן יונה או תור לחטאת
The Baal HaTurim notes that, throughout the Torah, turim, young doves, are mentioned before bnei yonah, turtledoves, except for the korban of the yoledes, postpartum sacrifice, when bnei yonah precede turim. He explains that the korban which the woman brings at the end of her yemei taharah, days of purification, consists of a single bird – either a tor or a ben yonah. The nature of the turtledove (which also goes by the name mourning dove) is that, when it is separated from its mate, it mourns it and refuses to mate with another. Therefore, it is more appropriate to…