The Libertarian Prime Directives are applied to reality, not derived from reality. A sparrow does not drop to the ground without a Libertarian running to figure out what libertarian ideology says should be done with the carcass.
That is why the LP platform is amusing reading. From the UN Charter on the moon to immigration, the LP has a categorical answer on what should be done. The "Party of Principle" is eager to apply those principles to every nook and cranny of existence. The LP does not believe in delayed gratification, any teological suspension of the ethical or any compromise. It is a gnostic faith.
[From the Libertarian Bible on Property Boundaries, Volume MMMCMXCIX]
If the sparrow lands squarely upon the boundary line between two sovereign's lands, then any currently licensed Sheriff of Rights from the People's Office for the Preservation of Rights and The Destruction of Tyranny must be called immediately upon discovery of the carcass, whose fees shall consist of whatever he happens to ask for at the time. A surgical microscope must be hired, and the carcass must be carefully cut in half, completely separating the molecules so as to not rob either party of their rightful parts. In the case of bones, the diamond surgical saw must be applied, and any splatter must be contained so that no piece ricochets unfairly across to the other's side. A notary public must be hired to attest that no rights were violated in the separation of the sparrow, and triplicates must be registered in the Great Hall of Fallen Birds, which is wholely subsidized by the voluntary contributions of the Guild of Whores. The party who consents to allow the Sheriff of Rights, the surgeon, and the notary public to enter their property will be compensated by an extra ten (10) percent of the booty. Any contestation of the results of the division must be registered with the Council on Duels, which will verify that all parties have the required insurance and prepaid funeral arrangements, or a Letter of Flagrant Disregard shall be filed by the next of kin, attesting that they consent to allowing their relation to be thrown to the jackels. The Council on Duels' required fees in gold shall be paid up front before the duel, which in turn will hire the True Assayer to verify the purity and content of the gold so voluntarily surrendered. The True Assayer's fee shall consist of fifteen (15) percent of the actual gold content. In the case of a deer which wanders across the boundary line when the sparrow carcass is being rightfully divided ....