( ( ( ( ( One ( of ( the crocodiles ) ) ) ( had ( slithered ( into ( the water ) ) ) ) ) and ) ( ( the other ) ( ( ( had ( ( his mouth ) ( wide open ) ) ) , ) ( cooling himself ) ) ) ) . )
(ROOT (S (S (NP (NP (CD One)) (PP (IN of) (NP (DT the) (NNS crocodiles)))) (VP (VBD had) (VP (VBN slithered) (PP (IN into) (NP (DT the) (NN water)))))) (CC and) (S (NP (DT the) (JJ other)) (VP (VBD had) (NP (NP (PRP$ his) (NN mouth)) (ADJP (RB wide) (JJ open))) (, ,) (S (VP (VBG cooling) (NP (PRP himself)))))) (. .)))
One of the crocodiles had slithered into the water and the other had his mouth wide open, cooling himself.
(ROOT (S (S (VP (VBG Lying) (PP (IN with) (NP (PRP$ their) (NNS mouths))) (ADVP (RB open)))) (, ,) (NP (DT a) (NN behavior)) (VP (VBD called) (SBAR (S (NP (NNP gaping)) (, ,) (ADVP (RB probably)) (VP (VBZ serves) (NP (NP (DT the) (NN function)) (PP (IN of) (S (VP (VBG cooling) (PRT (RP down)) (PP (IN for) (NP (NNS crocodiles))))))))))) (. .)))