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Orca mothers make 'lifelong sacrifice' for sons
Rearing a son is a lifelong cost for a killer whale mother, a decades-long study reveals.
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Orca mothers make 'lifelong sacrifice' for sons
Rearing a son is a lifelong cost for a killer whale mother, a decades-long study reveals.
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Orca mothers make 'lifelong sacrifice' for sons
Rearing a son is a lifelong cost for a killer whale mother, a decades-long study reveals.
How to watch
24-hour news, sport and programmes
Regional variations
Find out what is on BBC World News in your region
About BBC World News
More on the BBC’s international news and sport coverage
How to watch
24-hour news, sport and programmes
Regional variations
Find out what is on BBC World News in your region
About BBC World News
More on the BBC’s international news and sport coverage
