Stingrays are in the news again, specifically a particular lonesome stingray in the Blue Ridge Mountains. They’re interesting creatures. They’re all flat, and their eyes are on one side and their mouths on the other side so they can’t see what they’re eating. Which is probably a good idea since they’re eating unattractive fish and sea loogies like clams and oysters. They’re mostly made of cartilage, which is basically slouchy undercooked bone, such as the bendy material in your ears that keep them from flopping over like a beagle’s.
This particular North Carolina stingray is notable because she is pregnant. It’s easy to tell when a really flat fish is pregnant, and in this case she had a lump that looked like a biscuit on her back. But her keepers thought it was a tumor, because she hadn’t been near another stingray for over eight years. Upon further examination, the biscuit was revealed to be puppies. At least four of them. No telling where they came from, but the pups are due any day. They will be adorable.
Stingrays are oviviviviviviviparous. Their pups develop inside them fed by the yolk in their eggs and eventually they are expelled as complete critters, but distinguish themselves from us by forgoing the whole placenta thing.
Our star stingray has been alone in a tank with four sharks for eight years. Nobody is accusing the sharks of anything. They are not implicated in the pregnancy but have agreed to write up the paternity suit.
That is not quite true. In fact, many people have fingered the sharks in all this, but senior shark scientist Demian Chapman says “I give a shark the same odds of being the father that I would give Elvis…of being the father.” So, maybe!
Weirdly, scientists don’t really know what’s going on here. A while back a couple British stingrays gave birth after having not been around male stingray for over two years. At the time researchers assumed they had custody of some sperm before capture and just hung onto it, the way you keep the concert ticket from a really good date. Eventually, they elected to complete fertilization because that stuff doesn’t get any fresher over time. Perhaps our North Carolina stingray has a greater funk tolerance than the two in the UK.
But it’s also possible she just worked up the pups on her own out of pure boredom and ingenuity. In some creatures, an egg might be produced along with a smaller bonus cell, and they can become fruitful together and multiply without a sperm in sight. Given that male stingrays’ idea of foreplay is to creep up on a female and bite her repeatedly about the pectoral disc, which means most of her, this method may have evolved early. Parthenogenesis is known to occur in a number of species including crocodiles, condors, and Catholic girls in trouble.
This is as good a time as any to note that a “stingray,” in modern parlance, refers to the act of biting a scrotum during sex. Really, there’s no good time.
Stingrays rarely attack people unless they’re stepped on, which is what they have in common with spiders and some cats. Mostly people don’t die from it. Steve Irwin just got unlucky although it must be said that his likelihood of dying from some godawful marine monster was considerably higher than mine would be. I prefer to be at least sixty miles away from the ocean. Come the big earthquake, that coastline is likely to come to me, but I’ll take my chances.
I love every word of this post. A masterpiece!! And so cool!
You and I should write a nature book together.
Oh my gosh, can I pre-order this?
Me too, please!
The only way I could die from “some godawful marine monster” is if I ate it as sushi and died from food poisoning. I used to eat sushi when I was younger and immortal. Now, it has to be cooked. Preferably by me, as I know I wash my hands thoroughly when cooking. As for oysters and clams — they are wonderful (when cooked properly.) Raw? No way I’d eat them.
Opening a raw oyster and seeing pea crabs scuttling about in the oyster juice was horrifying enough for me to warrant a lifetime embargo.
You just solidified my embargo, which is based on way less.
I was literally laughing out loud reading this. The parthenogenesis line about the Catholic girls in trouble cracked me up in particular!
Was the V. Mary Catholic?
Has the Supreme Court weighed in on this yet?
I hope not. The frozen stingray embryo industry will go bust.
“..custody of some sperm and just hung onto it…”
Yes, like a queen honeybee! After her one-night mating flight, the queen bee has stored enough bee sperm to produce fertilized eggs for the rest of her life!
I hope there’s a DNA analysis once the little baby stingrayettes get loose.
Well how long do she live?
Parthenogenesis is technically possible in mammals, but in every observed instance it has resulted in cancer, not a fetus. Though some humans might be considered on par with cancer.
As far as the likelihood of Steve Irwin dying in misadventure with an animal, my fellow zoologists had unofficial bets on when that would happen given his proclivity to seek out bites from new and unusual life forms. I went as far as to speculate that his contract stipulated that he was supposed to be bitten a certain number of times per episode.
Case in point. Steve goes to Madagascar and just about every creature he unearths bites him. Jeff Corwin goes to Madagascar and handles the same critters as Steve Irwin ( maybe not the exact same creatures, but the same species) and none of them bite him.
Our big surprise was not that Steve Irwin died by misadventure. It was how he died. We assumed some venomous snake would do the deed. Instead a sting ray rammed its barb through his heart. Steve Irwin died from a massive puncture wound, not even from the venom in the barb.
Where is this Blue Ridge stingray? I’m close and would like to visit her/them/ya’ll.
But he had amazing style points. ANYONE can get a knife through the heart.
The Aquarium and Shark Lab in Henderson, NC.
Never mind. I found her! Her name’s Charlotte and she parthenogenerates in a tank on Main Street in Hendersonville, NC. Right by Immaculate Conception Catholic Church and Umi Sushi ($$). You can’t make this stuff up. As it happens, I’ll be in her vicinity all next week and with time on my hands. This gal reporter will file a story asap.
Oh, jeeze! Please tell us all about Charlotte! I heard about her on NPR’s Wait, Wait, Don’t Tell Me, and find it fascinating that this could happen. We depend on you, Nance!
On this Easter morning as I tolerate my 17th day of vertigo, etiology unknown, your post and the comments have had me laughing while my world spins. The best entertainment ever! And, as we weigh in on seafood, I eat nothing raw ever.🤢
Marcia…..find someone (a chiropractor or a physical therapist) that can do rhe Epley Maneuver……easy to do and it will banish the vertigo.
Yes…find someone that can do the Epley Maneuver. BPPV is not fun.
This is TERRIBLE!
Epley can be done by yourself! It works.
You can google it, and the YouTube video will show you how to do it.
Well, you know, if she is indeed having puppies, I think the sharks are off the hook. But there may be a water spaniel in the area with a grin on his face.😜