Commensalistic relationship
The southern masked-weaver bird is starting to make a nest in a tree in Zambezi Valley, Zambia. This is an example of a commensal relationship, in which one species (the bird) benefits, while the other (the tree) neither benefits nor is harmed.
Source
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"OpenStax College, Community Ecology. October 17, 2013."
http://cnx.org/content/m44878/latest/Figure_45_06_08.jpg
OpenStax CNX
CC BY 3.0.
