An organism's ecological role in the community, or a recess in the wall for a statue
... (Biology) ecology 
the role of a plant or animal within its community and habitat, which determines 
its... [DOC] [TLE] niche - definition of niche in English | Oxford Dictionaries [PAR] 1A shallow recess, especially one in a wall to display a statue or other .... 2.1
Ecology A position or role taken by a kind of organism within its community.