The next time Mark Zuckerberg invites you for a walk in the woods, you might want to make sure he's already eaten.

The 27-year-old Facebook founder raised eyebrows earlier this year after revealing that his 2011 "personal challenge" was to only consume meat that he had personally killed. "I'm eating a lot healthier foods," Zuckerberg told Fortune in May. "And I've learned a lot about sustainable farming and raising of animals. It's easy to take the food we eat for granted when we can eat good things every day."

The billionaire, now the richest American under the age of 40, reportedly has already killed a lobster, chicken, pig and goat as part of his new diet. According to Fortune, we can now also add bison to that list.

The site is saying that Zuckerberg recently acquired a hunting license and shot, killed and butchered a bison. One big tip that confirmed the news was a photo captioned "Bison Burgers" that was shown as part of Zuckerberg's personal Facebook page during the company's F8 conference.

While some have labeled Mark's personal challenge as eccentric, I think it's a fantastic way to understand where our food comes from — not to mention a surefire way to reduce one's meat intake and consume more vegetables and fruit. Our society is so far removed from what happens behind the walls of a slaughterhouse that you can bet the health of this country would be dramatically improved if everyone took up the Zuckerberg Challenge.

Now for 2012, let's see this guy go vegan...

Michael d'Estries ( @michaeldestries ) covers science, technology, art, and the beautiful, unusual corners of our incredible world.

Mark Zuckerberg shoots and kills a bison
Facebook founder takes his pledge to eat only what he kills to the next level.