nonterritorial

from WordNet (r) 3.0 (2006)

nonterritorial
    adj 1: not displaying territoriality; "a nonterritorial species"
           [ant: {territorial}]

from The Collaborative International Dictionary of English v.0.48

nonterritorial \nonterritorial\ adj. (Biology)
   not displaying territoriality; -- of animals; as, a
   nonterritorial species. Opposite of {territorial}.
   [WordNet 1.5]