Some 100,000 <i><a href="//commons.wikimedia.org/wiki/Myxococcus_xanthus" title="Myxococcus xanthus">Myxococcus xanthus</a></i> cells amassed into a fruiting body with spores, above. Experimental competitions showed that some strains of this social bacterium exploited others.
(Image: Michiel Vos)
CC BY 2.5
<i>Antisocial Behavior in Cooperative Bacteria (or, Why Can't Bacteria Just Get Along?).</i> PLoS Biology Vol. 3/11/2005, e398 <a href="//doi.org/10.1371/journal.pbio.0030398" class="extiw" title="doi:10.1371/journal.pbio.0030398">doi:10.1371/journal.pbio.0030398</a>