( Butterflies ( ( are ( found ( on ( ( every continent ) ( but Antarctica ) ) ) ) ) . ) )
(ROOT (S (NP (NNS Butterflies)) (VP (VBP are) (VP (VBN found) (PP (IN on) (NP (NP (DT every) (NN continent)) (PP (CC but) (NP (NNP Antarctica))))))) (. .)))
Butterflies are found on every continent but Antarctica.
(ROOT (S (NP (NNP Antarctica)) (VP (VBZ is) (NP (NP (DT the) (JJ only) (NN continent)) (PP (IN without) (NP (NNS amphibians))))) (. .)))