▁risk ▁factors ▁but ▁requiring ▁further ▁study . ▁In ▁the ▁Northern ▁Territ ory , ▁go anna ▁pred ation ▁on ▁can e ▁to ads ▁has ▁been ▁linked ▁to ▁a ▁rise ▁in ▁the ▁amount ▁of ▁und am aged ▁salt water ▁cro cod ile ▁eggs . ▁C ane ▁to ads ▁were ▁present ▁within ▁a ▁few ▁days ▁of ▁the ▁cro cod iles ▁h atch ing ▁in ▁April ▁ 2 0 0 7 . ▁ ▁N umer ous ▁native ▁species ▁have ▁been ▁reported ▁as ▁successfully ▁pre ying ▁on ▁to ads . ▁Some ▁birds , ▁such ▁as ▁the ▁black ▁k ite ▁( Mil v us ▁migr ans ), ▁have ▁learned ▁to ▁attack ▁the ▁to ad ' s ▁bel ly , ▁avoid ing ▁the ▁poison - produ cing ▁g lands ▁on ▁the ▁back ▁of ▁the ▁head . ▁A ne cdot al ▁reports ▁in ▁the ▁Northern ▁Territ ory ▁suggest ▁that ▁a ▁native ▁f rog , ▁D ahl ' s ▁aqu atic ▁f rog ▁( L itor ia ▁dah li i ), ▁is ▁able ▁to ▁eat ▁the ▁t ad pol es ▁and ▁live ▁young ▁of ▁the ▁to ad ▁without ▁being ▁affected ▁by ▁the ▁poison ▁that ▁often ▁k ills ▁other ▁pred ators . ▁This ▁may ▁account ▁for ▁slower ▁than ▁expected ▁inf est ations ▁of ▁to ads ▁in ▁certain ▁areas ▁of ▁the ▁Northern ▁Territ ory , ▁although ▁later ▁research ▁carried ▁out ▁joint ly ▁by ▁several ▁Australian ▁Univers ities ▁cast s ▁doubt ▁on ▁these ▁reports . ▁Some ▁s nake ▁species ▁have ▁been ▁reported ▁to ▁have ▁adapted ▁smaller ▁j aws ▁so ▁that ▁they ▁are ▁unable ▁to ▁sw