( ( Thick oil ) ( ( smothers ( animals ( such ( as ( birds ( and ( sea otters ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NN Thick) (NN oil)) (VP (VBZ smothers) (NP (NP (NNS animals)) (PP (JJ such) (IN as) (NP (NNS birds) (CC and) (NN sea) (NNS otters))))) (. .)))
Thick oil smothers animals such as birds and sea otters.
(ROOT (S (NP (NNP Sea) (NNS otters)) (VP (VBP are) (VP (VBN known) (PP (IN for) (S (VP (VBG being) (ADJP (JJ playful) (CC and) (JJ frisky))))))) (. .)))