( They ( ( ( have ( ( a ( thick layer ) ) ( of blubber ) ) ) ( under ( their skin ) ) ) . ) )
(ROOT (S (NP (PRP They)) (VP (VBP have) (NP (NP (DT a) (JJ thick) (NN layer)) (PP (IN of) (NP (NN blubber)))) (PP (IN under) (NP (PRP$ their) (NN skin)))) (. .)))
They have a thick layer of blubber under their skin.
(ROOT (S (NP (NP (DT The) (JJ thick) (NN skin)) (, ,) (VP (VBN found) (ADVP (RB only)) (PP (IN on) (NP (NP (NP (DT the) (NNS palms)) (PP (IN of) (NP (DT the) (NNS hands)))) (CC and) (NP (NP (DT the) (NNS soles)) (PP (IN of) (NP (DT the) (NNS feet))))))) (, ,)) (VP (VBZ has) (NP (DT an) (JJ extra) (NN layer))) (. .)))