( ( Saltwater crocodiles ) ( ( use ( thermoregulation ( to ( maintain ( body temperatures ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Saltwater) (NNS crocodiles)) (VP (VBP use) (ADJP (JJ thermoregulation) (S (VP (TO to) (VP (VB maintain) (NP (NN body) (NNS temperatures))))))) (. .)))
Saltwater crocodiles use thermoregulation to maintain body temperatures.
(ROOT (S (NP (NNP Thermoregulation)) (VP (VBZ is) (NP (NP (DT the) (NN process)) (SBAR (WHNP (WHADVP (WRB when)) (NNS animals)) (S (VP (VBP maintain) (NP (DT an) (JJ internal) (NN temperature))))))) (. .)))