( ( Macaw nestlings ) ( ( are ( ( ( what ( ornithologists ( ( ( term ( `` ( altricial '' ) ) ) , ) ( that ( ( is , ) ( ( unlike ( ( a chicken ) ( which ( is ( ( ( born ( with ( plenty ( of down ) ) ) ) and ) ( able ( to ( eat ( on ( ( it 's ) own ) ) ) ) ) ) ) ) ) ) ( , ( macaws ( are ( virtually ( helpless ( when ( first ( ( ( ( hatch and ) require ) ( ( vast amounts ) ( of care ) ) ) ( from ( their parents ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) or ) ( surrogate humans ) ) ) . ) )
(ROOT (S (NP (NNP Macaw) (NNS nestlings)) (VP (VBP are) (NP (SBAR (WHNP (WP what)) (S (VP (VBZ ornithologists) (NP (NP (NN term) (`` ``) (NN altricial) ('' '')) (, ,) (SBAR (WHNP (WDT that)) (S (VP (VBZ is) (, ,) (SBAR (S (PP (IN unlike) (NP (NP (DT a) (NN chicken)) (SBAR (WHNP (WDT which)) (S (VP (VBZ is) (UCP (VP (VBN born) (PP (IN with) (NP (NP (RB plenty)) (PP (IN of) (ADVP (RB down)))))) (CC and) (ADJP (JJ able) (S (VP (TO to) (VP (VB eat) (PP (IN on) (NP (NP (PRP it) (POS 's)) (JJ own))))))))))))) (, ,) (NP (NNS macaws)) (VP (VBP are) (ADJP (RB virtually) (JJ helpless) (SBAR (WHADVP (WRB when)) (S (NP (JJ first)) (VP (VBP hatch) (CC and) (VBP require) (NP (NP (JJ vast) (NNS amounts)) (PP (IN of) (NP (NN care)))) (PP (IN from) (NP (PRP$ their) (NNS parents))))))))))))))))) (CC or) (NP (JJ surrogate) (NNS humans)))) (. .)))
Macaw nestlings are what ornithologists term &quot;altricial&quot;, that is , unlike a chicken which is born with plenty of  down and able to eat on it's own, macaws are virtually helpless when first hatch and require vast amounts of care from their parents or surrogate humans.
(ROOT (S (NP (JJ Altricial) (NNS organisms)) (VP (VP (VBP are) (ADJP (JJ helpless) (PP (IN at) (NP (NN birth))))) (CC and) (VP (VBP require) (NP (NP (NNS lots)) (PP (IN of) (NP (NN help)))) (PP (IN from) (NP (PRP$ their) (NNS parents))))) (. .)))