Aggregated distribution of <a href="//commons.wikimedia.org/wiki/Parasite" class="mw-redirect" title="Parasite">parasites</a> on hosts: parasites are distributed very unevenly among their hosts, most hosts having no parasites, and a few hosts having many. This distribution makes sampling difficult and requires careful use of statistics.
<a href="//commons.wikimedia.org/wiki/User:Chiswick_Chap" title="User:Chiswick Chap">Ian Alexander</a>
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<span class="int-own-work" lang="en">Own work</span>