Rearing a son is a lifelong cost for a killer whale mother, a decades-long study reveals.
Source: US News and Business Report -usnewsandbusinessreport.com- – BBC Science External
Orca mothers make 'lifelong sacrifice' for sons
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Rearing a son is a lifelong cost for a killer whale mother, a decades-long study reveals.
Source: US News and Business Report -usnewsandbusinessreport.com- – BBC Science External
Orca mothers make 'lifelong sacrifice' for sons