Table 1.

Sample information. Subadults or neonates were collected only in September to ease the size comparison among different age groups, because parturition occurred synchronously in late August and September

Month	Date	Sample size	Male	Female	Subadult	Neonates
April	14‐April	14	10	4	0	0
May	11‐May	22	12	10	0	0
June	16‐June	20	8	12	0	0
July	14‐July	19	10	9	0	0
August	16‐August	16	8	8	0	0
September	15‐September	50	8	9	18	15
October	19‐October	17	8	9	0	0
November	14‐November	18	8	10	0	0