( ( ( Endangered animals ) ( such ( as ( the ( sea otter ) ) ) ) ) ( , ( ( ( are commonly ) ( seen ( in ( these areas ) ) ) ) . ) ) )
(ROOT (S (NP (NP (NNP Endangered) (NNS animals)) (PP (JJ such) (IN as) (NP (DT the) (NN sea) (NN otter)))) (, ,) (VP (VBP are) (ADVP (RB commonly)) (VP (VBN seen) (PP (IN in) (NP (DT these) (NNS areas))))) (. .)))
Endangered animals such as the sea otter, are commonly seen in these areas.
(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))))))) (. .)))