Bok
09-13-2012, 08:03 PM
Survival benefits to sons may favor orca menopause
More... (http://www.sciencenews.org/view/generic/id/345075/title/Killer_whale_mama%E2%80%99s_boys_live_longer)
More... (http://www.sciencenews.org/view/generic/id/345075/title/Killer_whale_mama%E2%80%99s_boys_live_longer)