( ( Other animals ) ( , ( ( such ( as ( small fish ) ) ) ( , ( ( ( secondary consumers ) ( -LRB- ( ( third ( trophic level ) ) -RRB- ) ) ) ( ( ( ( ( eat ( the ( primary consumers ) ) ) and ) thus ) ( are ( considered ( secondary consumers ) ) ) ) . ) ) ) ) ) )
(ROOT (S (NP (JJ Other) (NNS animals)) (, ,) (PP (JJ such) (PP (IN as) (NP (JJ small) (NN fish)))) (, ,) (NP (NP (JJ secondary) (NNS consumers)) (PRN (-LRB- -LRB-) (NP (JJ third) (JJ trophic) (NN level)) (-RRB- -RRB-))) (VP (VP (VBP eat) (NP (DT the) (JJ primary) (NNS consumers))) (CC and) (ADVP (RB thus)) (VP (VBP are) (VP (VBN considered) (NP (JJ secondary) (NNS consumers))))) (. .)))
Other animals, such as small fish, secondary            consumers (third trophic level) eat the primary consumers and thus            are considered secondary consumers.
(ROOT (S (NP (NP (JJ Secondary) (NNS consumers)) (PRN (-LRB- -LRB-) (SBAR (WHNP (WDT which)) (S (VP (VBP eat) (NP (JJ primary) (NNS consumers))))) (-RRB- -RRB-))) (VP (VBP are) (VP (VBN considered) (S (VP (TO to) (VP (VB be) (ADJP (JJ trophic) (NP (NN level) (CD 3)))))))) (. .)))