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ukraine's president zelensky is due to attend a summit of eu leaders in brusels. he's expeced to push for greater military assistance. this comes a day after he visited the uk and france. and a study of killer whales reveals that raising sons is a far more exhausting experience for their mothers. the support they provide carries a significant cost. they are less likely to have future kyles. to put it another way, when mothers have a son, they are more likely to stop reproduction. —— calves. fix, they are more likely to stop reproduction. -- calves. a very warm welcome. _ more th...

A decades—long study of killer whales off the north pacific coast has revealed that raising sons is an exhausting experience for mothers, leaving them much less likely to produce future offspring. the research suggests they are a lifelong burden on their orca mothers. here's our science correspondent victoria gill. the closest of bonds stop in killer whale family life offsprings stay by their mothers side for years. but sons are particularly dependent on mum, remaining with her well into adulthood. mothers even feed their much larger adult sons fish. feed their much larger adult sons fish-�...