Imagine the door to your home being an animal’s rear end. This is true for some species of pearlfish. They make their home in the intestines of sea cucumbers, coming and going through the animal’s cloaca. Some even feed on the innards of their host.
Carapus acus By Alessandro Pagano [CC-BY-NC-SA-3.0 (http://creativecommons.org/licenses/by-sa/3.0] via Wikimedia Commons. https://commons.wikimedia.org/wiki/File:Carapus_acus.jpg.
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