Because some animals fuck anything that moves and doesn&#x27;t, including dead animals[1] and other species[2]. Not sure if applying human categories such as &quot;homosexual&quot; to non-human animals is helpful, though.<p>[1] <a href="http:&#x2F;&#x2F;www.theguardian.com&#x2F;world&#x2F;2012&#x2F;jun&#x2F;09&#x2F;sex-depravity-penguins-scott-antarctic" rel="nofollow">http:&#x2F;&#x2F;www.theguardian.com&#x2F;world&#x2F;2012&#x2F;jun&#x2F;09&#x2F;sex-depravity-p...</a><p>[2] <a href="http:&#x2F;&#x2F;www.bbc.com&#x2F;earth&#x2F;story&#x2F;20141117-why-seals-have-sex-with-penguins" rel="nofollow">http:&#x2F;&#x2F;www.bbc.com&#x2F;earth&#x2F;story&#x2F;20141117-why-seals-have-sex-w...</a>