Table 1. A summary of the mean progesterone level (P4) in ng/g for all four species in different reproductive states.

	Immature		Mature Non-Pregnant		Mature Pregnant
	Mean P4 (ng/g)	n	Mean P4 (ng/g)	n	Mean P4 (ng/g)	N
Delphinus capensis	3.19	8	3.67	8	152.75	2
Stenella attenuata	1.03	5	1.05	1	435.08	2
Stenella longirostris	0.65	3	0.58	1	596.19	2
Phocoenoides dalli	2.31	3	8.29	4	1250.22	1
AllSpecies	2.08	19	4.58	14	516.9	7