[GAIUS libro secundo rerum cottidianarum siue aureorum. ] §41.1.3.prQuod enim nullius est, id ratione naturali occupanti conceditur.
[GAIUS, Everyday Matters (or Golden Words), Book II] For what belongs to no one is, by natural reason, granted to the occupant.
§41.1.3.1Nec interest quod ad feras bestias et uolucres, utrum in suo fundo quisque capiat an in alieno.
Nor does it make a difference, as regards wild beasts and birds, whether one captures them on one's own land or on another's.
plane qui in alienum fundum ingreditur uenandi aucupandiue gratia, potest a domino, si is prouiderit, iure prohiberi ne ingrederetur.
However, one who enters another's land for the purpose of hunting or fowling can, if the owner foresees it, be lawfully prohibited by the owner from entering.
§41.1.3.2Quidquid autem eorum ceperimus, eo usque nostrum esse intellegitur, donec nostra custodia coercetur: cum uero euaserit custodiam nostram et in naturalem libertatem se receperit, nostrum esse desinit et rursus occupantis fit:
Moreover, whatever of them we have captured is understood to be ours only so long as it is kept under our custody; but when it has escaped our custody and regained its natural liberty, it ceases to be ours and becomes again the property of the occupant.