Table 2.

Key biological data of selected dolphin species.

Species	Pregnancy (months)	Newborn length (cm)	Adult length (cm)	Newborn brain weight (gr)	Adult brain weight (gr)	Sexual maturity (years)	Life expectancy (years)
Tursiops truncatus	12	100	200-300	676	1296–1930	5–10♀; 8–12♂	>50
Stenella coeruleoalba	12–13	90-95	200	430–460	785–980	5–13♀; 7–15♂	>58
Stenella longirostris (orientalis)	10	75–80	150–200	n.d.	660	4–7♀; 7–10♂	n.d.
Stenella attenuata	11.5	80–85	180–260	n.d.	n.d.	9–11♀; 12–15♂	n.d.
Delphinus delphis	11–12	80–90	200	476	750–875	6–7♀; 5–12♂	>30
Lagenorhynchus acutus	11–12	110–120	250–280	n.d.	1,200	6–12	>22

White background: species analyzed in the article. Gray background: species used for comparison or quoted for reference; n.d., not determined. Biological data on Tt, Sc, and Dd are referred to Mediterranean specimens and taken from Cagnolaro et al. (2015); biological data on Sl, Sa, and La are referred to oceanic specimens and taken from Jefferson et al. (2015); brain weights of all species except Stenella longirostris are taken from Pilleri and Gihr (1970), and limited only to non-perfused brains of adult specimens (Tt: longer than 200 cm; Sl = Stenella styx and Dd:>170 cm). Brain weight of Stenella longirostris is taken from Hof et al. (2005). Weight of newborn brain of Tt and Dd are taken from Ridgway (1986); brain weight of newborn Sc is taken from Pirlot and Kamiya (1982) after authors’ correction for formalin fixation.