Table 4.

Sex ratios of mature fetus and newborn common vampire bats.

	newborn		mature fetus
sample period	male	female	male	female
18 Sep 1971	—	—	12	10
May 1970–Oct 1971	3	4	3	1
Apr 1972–Apr 1976	19	12
May 1992–Apr 1996a	7	9
Mar 1997–Oct 2000	13	10
total	42	35	15	11

^aData from Delpietro & Russo [25].