Age B (5% fecundity) Aditional years of life expected at age B Age M (95% fecundity) Aditional years of life expected at age M
Southern residents 13a 39±0.5b 41a 22±0.4b
Northern residents 11a 39±1b 41a 21±1b
Bigg’s 12a 46±2b 37a 32±2b