To celebrate Prince William's younger brother Harry 's 27th birthday, Prince William bought 250 pheasants, ducks and partridges to shoot, which made him and Kate the target of People for the Ethical Treatment of Animals (PETA).

According to FOX411's Pop Tarts column, PETA President Ingrid Newkirk has urged Kate to stop this deed.

We understand that Prince William has given a gift of ‘game birds’ to Prince Harry for his birthday, Newkirk wrote to Kate. There is no honor in buying birds and reducing them, as if they were clay pigeons, to shooting targets. Those who aren't killed outright are often dispatched by having their necks wrung, which does not cause an instant or painless death.”

Newkirk begged Kate to stop the shooting with her special influence. “May I ask you to use your influence on the Princes and ask them to reconsider this gift? You are in a unique position to be able to wield considerable influence over whether people everywhere view animals and their place in our world with kindness or blithely ignore their suffering. Please ask the Princes to open their hearts to the suffering of birds casually used as skeet and make the compassionate decision not to kill for fun, he wrote.

By cancelling the planned 'day's sport' in favor of a more enlightened, fitting and humane pursuit, they will win hearts and commendations and spare hundreds of birds a terrifying end, making it clear that the monarchy is in tune with the social movement against cruelty to animals,” Newkirk added.

Whether Kate will respond to Newkirk's passionate appeal remains unknown.

Start the slideshow to see what the royal couple is up to.

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