( It ( ( ( ( is not ) often ) ( that ( fossils ( provide ( ( direct evidence ) ( of ( animal behavior ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (PRP It)) (VP (VBZ is) (RB not) (ADVP (RB often)) (SBAR (IN that) (S (NP (NNS fossils)) (VP (VBP provide) (NP (NP (JJ direct) (NN evidence)) (PP (IN of) (NP (NN animal) (NN behavior)))))))) (. .)))
It is not often that fossils provide direct evidence of animal behavior.
(ROOT (S (NP (NP (DT The) (NN presence)) (PP (IN of) (NP (NP (DT an) (NN animal) (NN fossil)) (PP (IN in) (NP (DT a) (NN rock)))))) (VP (VBZ gives) (NP (NP (NN evidence)) (PP (IN of) (NP (DT the) (NN time) (NN period)))) (NP (NP (DT the) (NN animal)) (VP (VBN lived) (PP (IN in))))) (. .)))
The presence of an animal fossil in a rock gives evidence of the time period the animal lived in.