inquiline

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in·qui·line

(in'kwi-līn, -lin),
An animal that lives habitually in the abode of some other species (an oyster crab within the shell of an oyster) causing little or no inconvenience to the host.
See also: commensal.
[L. inquilinus, an inhabitant of a place that is not his own, fr. in, in, + colo, to inhabit]

inquiline

(ĭn′kwə-līn′, -lĭn, ĭng′-)
n.
An animal that characteristically lives commensally in the nest, burrow, or dwelling place of an animal of another species.
adj.
Being or living as an inquiline.

in′qui·lin·ism (-lə-nĭz′əm), in′qui·lin′i·ty (-lĭn′ĭ-tē) n.
in′qui·lin′ous (-lī′nəs) adj.