( ( ( Let 's ) ( hunt woolly ) ) ( ( mammoth instead ) . ) )
(ROOT (S (NP (NP (NNP Let) (POS 's)) (NN hunt) (NN woolly)) (VP (VBZ mammoth) (ADVP (RB instead))) (. .)))
Let's hunt woolly mammoth instead .
(ROOT (S (NP (JJ Woolly) (NNS mammoths)) (VP (VBD began) (S (VP (TO to) (VP (VB go) (NP (NP (ADJP (JJ extinct)) (NNS thousands)) (PP (IN of) (NP (NNS years)))) (ADVP (RB ago) (PP (IN because) (PP (IN of) (S (VP (VBG hunting) (PP (IN by) (NP (NNS humans)))))))))))) (. .)))
Woolly mammoths began to go extinct thousands of years ago because of hunting by humans.