This is why I enjoy the HN comments. Although, I should probably be upset that you sent me down a Wikipedia rabbit hole (the theory is interesting!): <a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Ungulate#Cetacean_evolution" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Ungulate#Cetacean_evolution</a>