( They ( ( have ( specialized ( in ( ( a ( particular niche ) ) ( of ( the market ) ) ) ) ) ) . ) )
(ROOT (S (NP (PRP They)) (VP (VBP have) (VP (VBN specialized) (PP (IN in) (NP (NP (DT a) (JJ particular) (NN niche)) (PP (IN of) (NP (DT the) (NN market))))))) (. .)))
They have specialized in a particular niche of the market.
(ROOT (S (NP (DT Each) (NNS species)) (VP (VBZ has) (NP (NP (DT a) (JJ particular) (NN way)) (PP (IN of) (S (VP (VBG making) (NP (NP (DT a) (NN living)) (, ,) (SBAR (WHNP (WDT which)) (S (VP (VBZ is) (VP (VBN called) (NP (PRP$ its) (NN niche)))))))))))) (. .)))
Each species has a particular way of making a living, which is called its niche.