An organism's ecological role in the community, or a recess in the wall for a statue
Such 
a... [DOC] [TLE] Niche | Definition of Niche by Merriam-Webster [PAR] 1 a : a recess in a wall especially for a statue b : something (as a sheltered or ... of 
an organism or species c : the ecological role of an organism in a community... [DOC] [TLE] (ecology) the status of an organism within its environment and ... [PAR] NICHE.