Animalia fera, si facta sint mansueta et ex consuetudine eunt et redeunt volant et revolant, ut cervi, cygni, etc., eo usque nostra sunt et ita intelliguntur quamdiu habuerunt animum revertendi

Wild animals, if they are tamed and are accustomed to go forth and to return, to fly out and fly back, such as deer, swans, etc., we understand to be ours as long as they have the intention to return. See 7 Coke, 16.