The Click

Museum storage is a cold room with a thousand drawers, and the one in front of me said feline, on a card the color of tea, in the typewriter hand of half a century ago.

I had asked for the carnivore backlog, because that is the sentence I have said at every job since 1994, and it has carried me up a staircase that narrows every year, and the morning the digitization project started, with the interns’ cart already parked in the hall, I said it again, because it was the only sentence I had that still obeyed me.

The project has a spreadsheet with a column for confidence, and the rule is that unknown is a real answer. The interns are good at unknown. They are less good at the cards, because the cards were written by people who knew, and the people who knew are gone, and the cards have outlived them.

The drawer opened easy. Naphthalene first, the smell of every collection ever made, then felt, then the skull in tissue the color of the card. It had the right weight for a cat the size of a puma. The lower jaw was gone, weather, or a collector who decided the teeth were the cargo and the rest was ballast, a decision our profession has been making since the eighteenth century.

My hands knew before my eyes did. Thirty years in a discipline: your hands store every skull they have held and do the identification in the dark, from the weight and the seams. The eyes got their vote eventually, and the skull was not what the label said. The profile was wrong for a modern felid. The cheekbones were set forward of where they belong, and the brow was built like an extension of something else, and the something else was the teeth.

I carried it to the bench without letting myself name it. The bench is a steel table with a foam cradle and a lamp on an arm, and I set the cranium in the cradle and let the lamp come down. Under the light: the canines. Two flattened blades, the family signature, the cross section of a knife where a cat keeps a cone. And short. I set the calipers on the right one and read the crown height: 47 millimeters, against 177 for a fatalis skull from the tar. The blade edges carried the fine crenulations the family files into its teeth, the serrations you can feel with a fingertip but not see, and the tips were worn from working. He had used them.

Adelphailurus. I said it out loud, which is a habit I have been warned about. Brother cat, the name means, in the Greek that paleontologists use for such things. A sabertooth the size of a puma, of the western plains, until tonight known from a broken jaw and some teeth, described in 1934 out of the old grass sea, out of the same Kansas gravels that hold the aquifer under half the High Plains. Ten million years, give or take. Brother cat. I had studied his family for thirty years and never once heard the name as a relation.

The ledger said he came in with a closing county museum’s whole donation, in the year the label got typed, at a time when nobody in this building read machairodonts, so he got what this building gives anything it cannot place: a card that says feline, and a drawer.

The room was quiet, the quiet of a thousand animals waiting to be looked at. Most of them will wait forever. There is one of me.

The department’s surface scanner was running before I thought to start it. It is a structured light machine, a projector and two cameras doing triangulation like a survey crew, down to a submillimeter, and on the bench it washed the cranium in a grid of fine black bars. The software read the bend of the bars and the skull came up on the screen out of points. Seams first, then the face, and last, because I saved it for last, the teeth. Every time, the teeth are last.

The machairodonts did not set out to be sabers. They started with the same round canine as the next cat, the cone. A cone takes a load from any direction and stands, which is why the cats have made the same round tooth for thirty million years and will make it for thirty more. Then one lineage found the edge, and the edge worked so well there was no going back, because the geometry forbids it. Shave a column into a blade and you have the best slicer on earth and the worst tooth on earth. Edge on, nothing cuts a throat like a blade. Sideways it is glass, and it breaks at the gumline the moment the prey twists, because the load comes in on the flat and the flat has no strength. The longer you make it the more it breaks, because the lever arm grows and the root does not. So the lineage built better knives and worse teeth, generation on generation, and the knife paid for the tooth, until the day the world stopped offering the only kind of kill the knife was for, and what was left to hit was bone.

And the cranium rebuilt itself for the blade, because a blade must be protected and aimed. The jaw hinge dropped and slid back so the mouth could open. About a hundred and twenty degrees, in the final forms, against a lion’s sixty-five. The neck muscle anchors grew into hafts. The lower canines shrank to nubs.

The strike was a single motion. The head came down like a hatchet, and the blade went in under the jaw, where the big vessels run, and the prey died of the cut, not of the chewing.

Four lineages made this same wager, separately, on different continents. The metatherian one in the south. The nimravids. The barbourofelines. The true cats. Around it the other drawer labels said Canis, Ursidae indet., Carnivora gen. et sp. indet., which is our Latin for we got tired.

The first paper was a short note on the type fragments of Adelphailurus, in the collection at Lawrence. I was twenty-four. The plates cost my advisor a week of his own salary; forty people read it; three cited it. I carried it around like a tooth I had grown myself.

I remember the click, though I did not call it that then. It was a Tuesday in the collections at Lawrence, a drawer of machairodont canines laid out on felt, and I picked up a fatalis tooth and put it down and picked it up again, and something in my chest turned one way and locked.

The grants came after, and a grant has a shape. It must promise results, and the results must be the next grant’s premise, and the premise must be narrower than the one before, because narrower is what a grant means by specific. By the third one I was studying the bite. By the fifth, the loads on the bite. By the seventh, the loads that break the tooth.

I became the world’s authority on the failure of the blade, by studying the blade until nothing was left but its failure. Around year six I stopped being able to tolerate a complete animal. A complete animal is an insult to a question you have decided to own. I held head after head from the pits and the caves and the road cuts, and every one of them reduced, under my attention, to a single part. You could have written my reviews for me. By the end I was not a paleontologist in the old sense, the sense that loves a whole skull.

Dana was a hydrologist. We met in Kansas, in a summer when I was digging the Miocene out of a road cut and she was measuring the water in the valley below it, which is in the long run the more important of the two excavations, and I bought her a beer in a town that had one of everything and told her she had the wrong formation. The water under the plains, I said, is a fossil resource. It is a hundred thousand years of rain, sitting in the same gravel my cats come out of. It will fail.

She said the same thing about my cats, and she meant the end of the Pleistocene, the collapse of the prey, the long teeth up to the root in the tar. We spent three hours agreeing about collapse, and eleven years agreeing about nothing else, and then the marriage did what marriages built like mine do. It narrowed. The teeth won. She kept her aquifer maps on the kitchen wall; I kept a cast of a fatalis tooth on the windowsill, and neither of us ever mentioned the other’s. Once, early, I held the cast out to her in my palm, and she turned it over and said it looked like a letter opener, and I laughed, because it did. The last time I held it out to her, she did not turn it over. She said, put that thing down, and I put it down, and I did not hold it out to her again. I do not remember the last time we laughed. I remember the last argument. It was about a field season I had agreed to lead in the week of her father’s service. I chose the pit. I said yes to the pit. And she said, standing in the kitchen with the coat she had come back for, that I did not have a job, I had a gape. One hundred and twenty degrees, she said, and nothing in the world fits in your mouth. She had heard me say it about the cats a hundred times.

She went west. The divorce was a formality; we had already divided the house into a kitchen wall and a windowsill. Water is a generalist’s science, and the aquifer is failing, and failure is full employment, so she is fine. I check every year. Her name on an abstract, and once a photograph of a monitoring well in the Panhandle, her boot on the casing, the water table a line on a screen. It matters to me that the one who got out is fine.

Marcus studies Homotherium. This is a sentence that has caused me to invent urgent errands at parties. Homotherium: the scimitar cat, the sabertooth who read the room. Shorter canines, serrated like a steak knife, thick enough to take a beating. Long legs, a stride, a diet of whatever was there. Outlived Smilodon everywhere it counted. The last sabertooth on earth was not the one with the longest teeth.

Marcus wrote the book. Marcus’s grants are wide and his gape is small, and the department finds this charming. He is the only person in the building who calls me by my first name, and the only one I answer to. One retirement party, for a generalist who had spent his career being useful at a volume nobody heard, Marcus said to me, over the rim of a paper cup: you ever write the survivor paper? The La Brea ones with the snapped canines that healed. The ones that kept eating with a stump. That’s your material. You’d write the hell out of it and then you’d forgive yourself a few things.

He meant it kindly, which was the part I could not stand. I told him survivorship was anecdote, that it was not functional morphology, that anecdote is what people write when they do not have a question. It was the meanest thing my vocabulary could produce, and I was proud of it, and I have been carrying it around ever since. He shrugged and went back to his life.

The La Brea specimens are real. I have seen them. The tar preserves everything, including the evidence against you: skulls where the saber broke off near the crown, the pulp sealed, the stump worn smooth by years of eating. The blade broke. The animal did not. Evolution kept its law, Dollo’s law, the tooth does not come back, irreversibility. Fine. Dollo’s law was about the tooth. Nobody had ever shown it applied to the cat.

I knew that, and I put it away, and I did not open that drawer again.

The email was waiting when the scanner finished, in the Foundation’s kindest font, three paragraphs of pity around one paragraph of knife. My phone lit a minute later: a colleague in New York, three words. Sorry. Saw the list.

The proposal was the end state of thirty years: finite element analysis of fracture loading in the machairodont canine. The panel found the methods sound. The panel had difficulty identifying a pathway by which the results might generalize to taxa beyond the study group.

The study group was Smilodon fatalis. The study group was me.

Generalize. I had watched a species make the identical wager for ten million years, and the committee had just administered the correction in a paragraph, because that is what systems do. They are not cruel. They are accurate. The ratchet had finally clicked forward and locked, and the lock ran all the way back, and I stood in the half dark with the projector’s light on my hands and the skull turning on the screen, gray as the gravel he came out of.

I did not delete the file. Last year’s me would have, the me who had already let the whole skull go. Instead I sat down on the steel stool and looked at the animal.

The cranium turned in the program’s slow orbit, and the scanner had the teeth by then: the little flattened blades, nearly two inches of tooth. I reached out and touched the screen at the base of the right canine, the place where the break always started. I had come back to him at last. Not to his failure. To his bet.

I put the new card in the clip on the drawer, typed with two fingers, everything spelled right. Adelphailurus kansensis. Machairodontinae. Referred specimen. Clarendonian. Ogallala Formation, western Kansas. Ten million years, give or take.

The old card, the color of tea, went into my shirt pocket, over my heart, where the scanner’s light could not reach it.

I texted Marcus three words: send me the La Brea list. The dots came, and then: there you are.

The new paper is a short document. It will have a table of broken canines and sealed pulp, and a line about the ones that kept eating with a stump, and it will not generalize to anything beyond the study group. Forty people will read it, and three will cite it, and I will carry it around like a tooth I grew myself. Its first line is the only line I knew how to write at twenty-four, before the grants taught me not to. The blade is a bet.

In my pocket, the color of tea, in the typewriter hand of half a century ago: feline. The card is soft at the corners. It will not go into the spreadsheet. Let the ratchet have the rest.