Her brother-in-law has led a personal crusade against poaching and protecting vulnerable wildlife.
So Pippa Middleton's decision to enjoy a plate of whale meat on holiday may have been rather difficult for Prince William to swallow.
The 31-year-old, who styles herself as a food and lifestyle writer, has told of eating Minke whale - even though it is largely banned worldwide. She boasted of tucking into the delicacy in Norway, to the horror of environmental campaigners who say she is helping promote an "unimaginably cruel" trade.
In a gushing newspaper feature, the Duchess of Cambridge's younger sister described how the smoked meat was served in a "wonderfully convivial atmosphere" at the Juvet Landscape Hotel in north-west Norway.
Tucking into a starter prepared carpaccio-style - raw and very thinly sliced - she wrote: "We dined on smoked whale carpaccio (which tastes similar to smoked salmon but looks more like venison carpaccio)."