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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
US channel finder
24-hour world news on TV available across the US
About BBC World News
More on the BBC’s international news and sport coverage
How to watch
24-hour news, sport and programmes
US channel finder
24-hour world news on TV available across the US
About BBC World News
More on the BBC’s international news and sport coverage