Study suggests surprising reason killer whales go through menopause

 
There are many reasons that promote the development of animal protection law. Bio-prejudice is a term that has been used to describe a preference, or aversion, to a species based on its similarities to people. For example, people are generally more supportive of protecting species like pandas, elephants and whales than many other species e.g. spiders
 
And there is a definite link and animal protections for a species when science identifies traits that have people thinking "they are like us". And sometimes, the similarities can be very surprising. Who, for example, would have thought that there might be similarities on the subject of menopause?
 

Only three known species go through menopause: killer whales, short-finned pilot whales, and humans. Two years ago, scientists suggested whales do this to focus their attention on the survival of their families rather than on birthing more offspring. But now this same team reports there’s another—and darker—reason: Older females enter menopause because their eldest daughters begin having calves, leading to fights over resources. The findings might also apply to humans, the scientists say.