The Prince of Wales has been outspoken about his love for animals and has championed environmental causes throughout his life. In 2008, Charles' deputy master of the household, Andrew Farquharson, said the royal’s chefs had been instructed not to buy foie gras.

       He said: “The Prince of Wales has a policy that his chefs should not buy foie gras.”

       In the process of making the popular spread, male ducks have pipes rammed down their throats twice each day.

       The pipes pump “up to 2.2 pounds of grain and fat into their stomachs, or geese three times a day, up to 4 pounds daily,” according to animal rights organisation Peta.

       As a prominent conservationist, the heir to the throne has supported causes which help restore animal populations.

       Last month he oversaw the release of 11 Eurasian curlew chicks, Britain's most threatened bird species.

       He watched as the birds were released on the Queen’s Sandringham estate in Norfolk.

       Charles said: "I have always cherished the evocative call of the curlew, but it is now dangerously close to being something that our grandchildren will never have the chance to enjoy.

       "This initiative would not have been possible without the tireless work of many people and organisations working in partnership towards a common aim."

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