Sexing the Single Caiman

I suppose some people would look at this gatorbelly and think what a nice pair of boots it would make. That kind of lust for its beauty put the black caiman in a huge downward spiral from the 1950's to the '70's, and it's only just recovering from the slaughter. Black caimans, like so many creatures persecuted elsewhere (giant otters, for one), are still common on Guyana's beautiful Rupununi River. I am so thankful for Guyana, for the Rupununi, for huge reptiles that make a swirl in the water.

I looked at the caiman's tiled abdomen and said a prayer to all that is beautiful and perfect just as it is.

Ack. What are they doing?

Feeling for conclusive evidence of the giant caiman's sex, that's what. Think fetal sonograms: If you don't feel anything, it's a female. Male caimans, like all reptiles, and all aquatic creatures as I think about it, keep their wedding tackle inside until they need it.

I resolved not to shake Ashley Holland's hand when I thanked him for our excellent nocturnal adventure.

And it was a female, and her toes curled when they did the internal exam. Awww.

"They always do that," our leader commented. It felt disrespectful to laugh, so I covered it up with a little wheezy cough.


Because there are not too many places where you're going to be able to look close-up at a caiman's vent, here it is. I was awestruck. I had this flood of images running through my head, of cells dividing in the embryo, of God with a sewing machine, of somebody or some antic evolutionary force figuring out how to resize and then upholster those Formica scales smoothly over living muscle and make them fit, flexibly airtight, around a sphincter. Ye gods. Design, functionality, beauty and awe in a caiman's bunghole.


I am in Science Chimp heaven. Again. Geeking out, hands on a ten-foot, three-inch wild female black caiman. That's as big as she will probably get. Who knows how old she is? Whether she'll keep growing?

Males can get to 16.5 feet, and Wikipedia says "The largest reported black caiman, measuring 7.7 meters (25.2 ft) and weighing 1,310 kg (2,870 lb), was shot in Acre, Brazil in 1965 and, which if accurate, would count as the largest crocodilian recorded besides saltwater crocodiles."

Pause to let that sink in. Look around, eyes crossing. That's four feet longer than my living room. A twenty-five-foot-long black caiman? How would it even turn around in smaller rivers? How old must it have been?

and how I wish they'd marked and released it instead of shooting it. (It would only take about 20 men to hold it down, c'mon!) Here's the thing. Some reptiles are said not to stop growing over their lifetimes. Kind of like fish or lobsters...you haul up this leviathan, and the first thing you have to wonder is how old it must be.

Now, for the first time, right in front of my astonished eyes, researchers are getting growth and allometric and reproductive data on this species. To find out more about the study, initiated by herpetologist and conservationist Peter Taylor, please click the link. The study involves local Amerindians, who are learning first hand how to study and protect the species, and realizing the benefits from the ecotourism that follows having a healthy population of a spectacular reptile (not to mention a spectacular mustelid, felids and endless fabulous birds).

By a clipped scute on her tail, they knew she was a recapture. So they could compare how her measurements had changed since the last time they had her in the noose. This is how we learn, this is how we answer the questions I've posed and so many more.

It was kind of upsetting to see the wrassling necessary to subdue a study subject, but it was all good. For everyone but the caiman, I suppose. She was not enjoying herself anywhere near as much as I was.

Zick, a bundle of firing synapses barely contained by her Life is Good shirt. Photo by Erica Gies.

There there, old lady caiman. They're almost done with you now.

Measurements and sexing all done, it was time to truss the poor girl up like a Thanksgiving turkey so no bits would hit the ground when she was being hoisted up on the hanging scale.

Somewhere I wrote her weight, in the dark, maybe in my little notebook. I can't find it. I found some scribbles, but the weight isn't among them. Rats. At this point all us Marlon Perkins pikers were really, really ready to see the Jim Fowlers put her back into the water, free of all this manhandling.

The Guyanan assistant tied the most amazing knot to keep her jaws closed while the noose and the tape was removed. It could be loosened with just one tug, like the sewn seam on a 50-pound bag of bird seed. I watched him tie it, careful but lightning fast, and all the wonder I felt at the caiman's perfection leapt over to those beautiful hands. Homo sapiens is one boffo primate.

They carried her to the water's edge--grunnnnnt!-- and pulled on the magic knot with a long cord.

One tug, and she was free, and nobody had to lose a hand untying her jaws. Pretty dang slick.

The whole time she was lying trussed up she was sighing, a deep, watery rumble from her very guts, and the sound moved me, as the sighs of a beached whale would. It was good to see her great jaws come open, and she said Ahhhhh again and then she was gone, just a huge muscular lash on the water's surface.

And silence, and the sound of my own breathing.

Feeling the Caiman

I had so much fun shooting the aquatic struggle that I was almost disappointed when the researchers landed the beast and we got to see our quarry close up. It would be flash shots from now on. Rats. But my goodness. That is a BIG CAIMAN. Not your average baby alligator.

As you can see, they've managed to run some electrician's tape around her jaws. Crocodilians have tremendous crushing power to bring the jaws closed, but comparatively little to open them, so you can realistically expect to subdue a caiman with tape. That is, if you know what you're doing. It's the whole principle of successful alligator wrestling. Once you get the jaws closed and secure, all you have to worry about is the tail and feet and the sheer massive fishy strength of the beast. Almost eleven feet long. A very big caiman. The researchers were guessing it was a male, because males get bigger than females.

I was squeezing and palping and feeling the caiman all over like a blind person--we all were. I couldn't believe my good fortune to be able to touch and press the flesh of an animal so mysterious and dangerous. There was something holy about it.


A communion.
It was time to turn the animal over.I absolutely could not get over the beauty of this animal. I had to run my hands over that smooth, cobbled belly skin.

It felt like soft, slightly pliable plastic tile. Tile, laid over someone's torso. There was something disarmingly human about the beast, laid out like a patient on a table. She was completely motionless, heaving a deep, rolling, watery sigh now and then. The researchers bent over her, measuring every possible length and circumference of her amazing length, Lilliputs bent on discovering everything they could about poor, tacked-down Gulliver.

Next: Sexing the Single Caiman.

Caiman Hunt!

This is about all you ever see of a wild caiman--a pair of eyes looking at you, then slowly submerging.

After my experience with the giant anteater, I was feeling iffy about one of the activities booked for us on the night of our arrival at Caiman House. We would hunt down a caiman and measure and collect data from it. Well, obviously we faint-hearted writers and artists and photographers wouldn't do it; researchers and assistants would do it while we watched and tried to take pictures in the pitch-black night. I came very close to saying no, no thank you, I would rather see a caiman minding its own business. I fought with myself all through dinner, then realized that if I was ever going to learn more about caimans, this would be the time. You have to live life as big as you can, or not much happens.

They pronounce it Kye-mon (rhymes with sky).

Most of us think of caimans as "baby alligators," and many of us probably remember when they were offered as new hatchlings in pet shops. God, what a horrible thing that was, but I remember friends who kept small, sickly tan "baby alligators" in little fishtanks in their homes. File under WHAT WERE WE THINKING? The black caiman is not a baby alligator. It is a huge beast, a crocodilian to be reckoned with. Not as dangerous as a croc or an alligator, but not to be messed with, either. And thank goodness they're no longer being exploited for the pet (slow death in captivity) trade. Although I still see quite a few, stuffed with straw and shellacked, lined up on store shelves, shaking maracas and playing marimbas in the Latin American tourist traps. Bleh.

What was happening here was a caiman capture. Researchers, armed with long catchpoles and nooses, big hanging scales and measuring devices, would attempt to noose an adult caiman, determine if they'd seen it before (using a scale-clipping code that identifies the animal), weigh, measure and sex it, then release it. We were warned that, in order to tire the animal out and render it tractable, they would fight it as they would a game fish for quite some time before attempting to handle it.

It turns out that this is the best way to deal with large caimans. It's not safe to tranquilize the animal because we don't know much about dosages, and because there are a lot of other caimans around looking to climb the caiman social ladder, releasing a caiman that's groggy could result in drowning, maiming and death for the study animal. And it's not safe to try to handle a fresh, snappy caiman, so this is the method they've arrived at as safest both for animal and researchers.

So, tired from a full day of Karanambu and river birding and hiking to Caiman house, we piled into boats and went looking for a big caiman to catch. I was already fretting because I didn't know how I was going to photograph the action in total darkness. I shouldn't have worried. First look at the beast, hauled from the deep.Oh my gosh. Can it really be that big?
Agggh! Look at that THING! It is HUMONGOUS!

I mentioned fighting the animal to play its strength out. I had plenty of time during the tussle to experiment with different ISO's and apertures, flash or no flash. My favorite pictures were made in ambient torch light (we in the boat had flashlights trained on the action). I love this slow-shutter shot.
When the caiman would go quiet, I could get some that were almost sharp. Was it a crocodilian, or a fire-breathing dragon they had? Oh, oh oh, these are for you, Timmo.

It was as if her rage shone from her jaws.

The lizard wranglers had made an unfortunate catch, looping the noose around the caiman's upper jaw instead of around the whole head or neck. So much of the maneuvering was trying to get its mouth closed and another noose around the jaws. That would be key to handling it safely. I really like this shot. The flash is illuminating the scene just enough to freeze the action, but not enough to burn out the colors and chiaroscuro.

The caiman is surrendering.I have to go lie down now. More anon.