Published
A study of orcas in the North Pacific has revealed that mothers make a "lifelong sacrifice" for their sons.
Rearing a son significantly reduced a female killer whale's chance of reproducing in the future.
The energy they need to feed sons appears to compromise their health, leaving them less able to reproduce and raise other young.
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Rearing a son significantly reduced a female killer whale's chance of reproducing in the future.
The energy they need to feed sons appears to compromise their health, leaving them less able to reproduce and raise other young.
Please subscribe HERE http://bit.ly/1rbfUog
#Orcas #Orca #BBCNews
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