( ( The nestlings ) ( ( ( ( are altricial ) , ) ( meaning ( that ( they ( ( ( are helpless ) and ) ( need ( to ( be ( cared ( for ( by ( the parents ) ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NNS nestlings)) (VP (VBP are) (ADJP (JJ altricial)) (, ,) (S (VP (VBG meaning) (SBAR (IN that) (S (NP (PRP they)) (VP (VP (VBP are) (ADJP (JJ helpless))) (CC and) (VP (VBP need) (S (VP (TO to) (VP (VB be) (VP (VBN cared) (PP (IN for) (PP (IN by) (NP (DT the) (NNS parents))))))))))))))) (. .)))
The nestlings are altricial, meaning that they are helpless and need to be cared for by the parents.
(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))))) (. .)))