( Snakes ( ( are ( ( ( carnivorous animals ) , ) ( which ( means ( they ( eat ( only ( other animals ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNS Snakes)) (VP (VBP are) (NP (NP (JJ carnivorous) (NNS animals)) (, ,) (SBAR (WHNP (WDT which)) (S (VP (VBZ means) (S (NP (PRP they)) (VP (VB eat) (NP (RB only) (JJ other) (NNS animals))))))))) (. .)))
Snakes are carnivorous animals, which means they eat only other animals.
(ROOT (S (NP (NNS Snakes)) (VP (VBP are) (NP (JJ carnivorous) (NNS animals))) (. .)))