Research animals have &quot;ports&quot; inserted so researchers can see various stages of digestion.<p><a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Cannulated_cow" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Cannulated_cow</a><p>This allows them to make sure things like &quot;cow magnets&quot; aren&#x27;t going to be harmful