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Not Quite A Cat? Wasn’t This Supposed to be About Whales?

Sometimes when it looks like a cat and acts like a cat it’s not; it’s a nimravid! Nimravids are a rather problematic group in the order Carnivora of uncertain descent. Entering the fossil record in the late Eocene (36 million years ago), their exact relationship to other carnivore families is unresolved, but they paralleled cats to an amazing degree. With short faces and fully hooded, retractile claws, they came in body shapes and sizes that covered all of the diversity that true cats would later manifest. Some were as small as house cats, while others were the ecological and functional equivalents of lynx, cheetah and leopard. And all except one lone genus were saber-toothed.

Before we go on, let’s get these curved teeth straight. Saber-teeth evolved from normal, conical canine teeth into two forms. Dirk teeth were the long, curved, finely serrated blades that we normally think of when we think saber-toothed. The famous Smilodon - the saber-toothed “tiger” of LaBrea Tar Pits fame - was a dirk-toothed true felid. There were also scimitar-toothed animals with shorter, more coarsely serrated blades that usually evolved in conjunction with
longer-legged cursorial body types. Most of the dirk-toothed animals were compact, robust stalkers.

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