( ( Early humans ) ( ( ( ( hunted ( the ( Woolly Rhinoceros ) ) ) and ) ( ( ( drew ( pictures ( of ( the animals ) ) ) ) ( on ( cave walls ) ) ) ( ( as far ) ( as ( ( 30,000 years ) ago ) ) ) ) ) . ) )
(ROOT (S (NP (JJ Early) (NNS humans)) (VP (VP (VBZ hunted) (NP (DT the) (NNP Woolly) (NNPS Rhinoceros))) (CC and) (VP (VBD drew) (NP (NP (NNS pictures)) (PP (IN of) (NP (DT the) (NNS animals)))) (PP (IN on) (NP (JJ cave) (NNS walls))) (ADVP (ADVP (RB as) (RB far)) (PP (IN as) (ADVP (NP (CD 30,000) (NNS years)) (RB ago)))))) (. .)))
Early humans hunted the Woolly Rhinoceros and drew pictures of the animals on cave walls as far as 30,000 years ago.
(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.