Table 1.

Examples of species specificities in mammalian reproduction within and across families [2, 4–6]

Common and scientific names	Sexual maturity (months)	Seasonal breeder	Estrous cycle (days)	Estrus (days)	Ovulationa	Gestation (days)
Black-footed cat (Felis nigripes)	12–21	No	5–29	2–9	Ind.	63–71
Bobcat (Lynx rufus)	10–12	Yes	44	5–10	Ind.	50–70
Cheetah (Acinonyx jubatus)	24–36	No	7–23	2–6	Ind.	90–98
Clouded leopard (Neofelis nebulosa)	20–30	Yes	25–30	3–6	Spont.	85–93
Domestic cat (Felis catus)	5–12	Varies	14–21	3–7	Both	64–67
Asian elephant (Elephas maximus)	120–140	No	100–110	2–4	Spont.	640–660
Eld’s deer (Rucervus eldii)	18–22	Yes	20–24	1–2	Spont.	230–240
Giant panda (Ailuropoda melanoleuca)	60–70	Yes	7–10	1	Spont.	80–180b

^aInd. induced, Spont. spontaneous

^bBroad range due to delayed implantation of the embryo