Mark Zuckerberg is challenging himself this year by only eating meat he personally slaughters, reports Fortune's Patricia Sellers. "I just killed a pig and a goat," Zuck posted to his private Facebook page on May 4th, eliciting a wide range of responses from his 847 friends. The kill-what-you-eat approach is the latest in a series of "personal challenges" he has set for himself each year (the last one: learn Chinese). "[T]he only meat I'm eating is from animals I've killed myself," Zuckerberg told Fortune. He started small, boiling live lobsters, then graduated to chickens, finally slitting a goat's throat. "So far, this has been a good experience."

Not to be outdone, we decided to break in to Zuckerberg's Palo Alto home, to see what else we could learn about his budding survivalism. In the backyard, just beyond the goat carcass and set of Bowie knives, next to an axe buried in the stump of an oak tree Zuckerberg had felled himself, we came upon the manuscript of a book, "The Mark Zuckerberg Field Guide." Click ahead for excerpts from this work in progress, in which we see some of the most dangerous game Zuck has hunted.

The Winklevoss is a hulking, towering, blond-haired beast that tends to roam in pairs. The amphibious creature can be found stalking the streets of Cambridge or skimming along the surface of the Charles River. Formidable but often deemed dim-witted, the Winklevoss is easily deceived, though infallibly litigious. Meat is tough and gamey, but all parts are edible.

This invasive species, originating in the wilds of Sao Paolo, Brazil, made its way to New England using nothing but cunning, strength, and affirmative action. While domesticable--the author once had one as a companion--the Saverin is ultimately best dispensed with in the same manner as the Winklevoss. It is best to fire your crossbow before the Saverin's doe eyes worm their way into your conscience. Gut with fillet knife and cure with citrus.

An obscure, winged, parasitic insect verging on extinction. Cousin to the mosquito, the Klayman will attempt to suck your blood at every chance it gets. Sensing imagined predators everywhere, the Klayman will doggedly pursue the hunter and attempt to sap him of his energy. Best dispensed with a fly swatter and insect repellent.

Whereabouts unknown. The MySpace, a forgotten grublike creature, was only briefly considered worthy sport for hunters and survivalists. Attempts at metamorphisis met with failure; this bug has presumably become the diet of other, more significant foraging creatures. Best ignored.

A nuisance which no true woodsman cares about. Dispensed with a single roundhouse kick.