Jonathan Crowe

Book reviewer, cat photographer, fanzine editor, map blogger, snake whisperer.

Tag: Crotalus

Spring Peeper

A Herpetological Roundup

  1. With fewer than 100 individuals believed to exist in the wild, the Lake Pátzcuaro Salamander (Ambystoma dumerilii) or achoque, found only in and around Lake Pátzcuaro in Michoacán, Mexico, is critically endangered. They’re getting help from an unusual corner: Dominican nuns at a nearby convent, who for the past 150 years have been raising the salamanders in captivity. (They use them to make a “mysterious” medicine: a cough syrup called jarabe.) See this long and fascinating read in the New York Times, which is accompanied by first-rate photography.
  2. A biologist is warning that Okanagan populations of the Northern Pacific Rattlesnake (Crotalus oreganus) are 100 years from extinction. The snake is at the northern limits of its range, and it’s down to between 1,500 and 2,500 individuals. It’s listed as a threatened species. There are populations in more trouble, and sooner (see above), but this is worth keeping an eye on.
  3. Male rattlesnakes engage in ritual combat during mating season. Here’s video of a pair of male Timber Rattlesnakes (Crotalus horridus) getting fighty with each other. Here’s another video from California, species unidentified.
  4. A beautiful essay by Laura Marjorie Miller on the controversial plan to reintroduce the Timber Rattlesnake to an island in the Quabbin Reservoir in Massachusetts, which I’ve mentioned in previous roundups.
  5. Where do snake-handling cults get their snakes? As The State discovered, South Carolina. Thanks to the lack of restrictions on the sale of venomous snakes, snake-handling preachers from other states regularly buy their snakes at reptile shows.
  6. CityLab takes a look at Isha Serpent, a volunteer snake rescue group in Madhurai, India; the snakes being rescued include spectacled cobras, kraits, and Russell’s and saw-scaled vipers. The group’s been active since 2009 and has relocated more than 2,000 snakes—with, they claim, no envenomations.
  7. A new study suggests that cats have a significant impact on reptile populations: in a field experiment, cats were removed from six 64-hectare plots; over a two-year period, reptile populations rebounded significantly in those areas. [Biological Conservation]
  8. A fossil snake embryo or neonate from the late Cretaceous has been found preserved in amber in Myanmar. [Science Advances]
  9. One of the most common questions people like me get from strangers: how do I snake-proof my yard? Here’s a comprehensive answer: I think I’ll point people to it from now on.
  10. Last month the Herpetologists’ League gave Richard Vogt the Distinguished Herpetologist award. Vogt, who made the significant discovery that incubation temperature can determine a turtle’s sex, proceeded to pepper his plenary lecture with photos, some of which were “censored” with coloured boxes, of his scantily clad students. (Research on aquatic reptiles often involves swimwear, but Vogt was apparently, and regularly, gratuitous.) Stories soon followed about Vogt, who appears to be someone female herpetologists have to warn one another about. News coverage in the #metoo era—local from the Rochester Democrat & Chronicle, national from the New York Times—was inevitable. Vogt’s award was rescinded, the League’s president has resigned, there was much huffing and puffing from one former league president on Vogt’s behalf (and presumably others), and the League’s new president is taking a tough line on harassment and misconduct. A code of conduct is in the works.

Question I’ve answered on Quora recently:

Featured image: Spring Peeper (Pseudacris crucifer) found on our property on August 10, 2018.

A Herpetological Roundup

  1. Fix and Release” is a 15-minute CBC documentary on the Ontario Turtle Conservation Centre’s work rehabilitating injured turtles. [YouTube]
  2. More signs that reptile population locations are being obscured or hidden to keep the animals from being poached or killed: scientists released 6,000 eastern spiny softshell (Apalone s. spinifera) hatchlings near London, Ontario, but the location is being kept secret.
  3. Here’s a short video on building a snake hibernaculum on your property, hosted by two friends of mine: Jeff Hathaway (of Scales Nature Park) and Ben Porchuk, whom I met while messing about on Pelee Island.
  4. Dozens of snakes—western fox snakes (Pantherophis ramspotti) and racers (Coluber constrictor)—were rescued from a well scheduled to be demolished.
  5. Last month a Peterborough, Ontario man was bitten by a monocled cobra (Naja kaouthia) and had to be given given antivenom from the Toronto Zoo’s stock at Scarborough and Rouge Hospital. [CBC NewsToronto Star]
  6. The Calabar burrowing python (Calabaria reinhardtii) is an unusual egg-laying boa from central Africa. It’s a nest-raider that feeds primarily on baby rodents. Mama rodents tend to have a thing or two to say about that, so it turns out that Calabaria has an extraordinarily thick skin that resists penetration (i.e., from bites)—thicker and tougher than any other snake they compared it to, causing researchers to call it a “rhinoceros among serpents.” [Journal of Morphology]
  7. Climate change may be making bearded dragons (Pogona vitticeps) dumber. The National Geographic headline is a bit clickbaity; the underlying study suggests that incubation impacts social cognition. “Lizards incubated at colder temperatures were quicker at learning a social task and faster at completing that task.” The study determined that the effects of incubation temperature lasted into adulthood. The effect of rising global temperatures follows from that. [Royal Society Open Science]
  8. Last week the New York Times reported on snake fungal disease, which has featured prominently in previous posts. A new study suggests that in the eastern United States snakes afflicted by the fungus “are both phylogenetically and ecologically randomly dispersed”—i.e., widely different species in widely different habitats—and that monitoring “should consider that all snake species and habitats likely harbor this pathogen.” This is, as they say, bad. [Science Advances]
  9. Paul “Little Ray” Goulet is another old friend, and the proprietor of Little Ray’s Reptile Zoo in Ottawa. For the past few years he’s been offering free passes over the holidays to disadvantaged families who’d otherwise be unable to afford to go to the zoo. (Zoos, whether private or public, are a lot more expensive than they used to be.) Here’s the Ottawa Citizen story.
  10. Finally, here’s video footage of a western diamondback rattlesnake (Crotalus atrox) riding on the back of a tortoise. Yee-haw. [UPI, YouTube]

A Herpetological Roundup

Turtle-headed Sea Snake (Emydocephalus annulatus), Okinawa, Japan, July 2011. Photo by Klaus Stiefel. Creative Commons Licence.

  1. The Christian Science Monitor reports on how the residents of the town of Glastonbury, Connecticut learned to live with—and help protect—the endangered Timber Rattlesnake (Crotalus horridus).
  2. When cicadas emerge, they’re a plentiful food source for many species—including, as the Houston Chronicle’s Shannon Tompkins learned, Copperheads (Agkistrodon contortrix), which aggregate in large numbers and stuff themselves silly.
  3. Pollution is turning sea snakes black. The Turtle-headed Sea Snake (Emydocephalus annulatus) normally has a banded pattern (see above), but individuals found in polluted waters around New Caledonia are increasingly melanistic. It’s a phenomenon called “industrial melanism”: melanin tends to bind to metal ions of trace elements like arsenic and zinc; melanism and an increased shed cycle allows these snakes to rid themselves of toxic metals. [Current Biology]
  4. Speaking of sea snakes, say hello to the Yellow Sea Snake (Hydrophis platurus xanthos), a newly discovered subspecies of the Yellow-bellied Sea Snake that is found in the warm, turbulent, anoxic waters of Golfo Dulce, off the Pacific coast of Costa Rica [Zoo Keys]
  5. When it comes to invasive reptiles in Florida, Burmese Pythons get all the press, but they’re not the only ones; CNAH lists 65 alien reptiles and amphibian species introduced to North America, most in Florida. Three of those species are chameleons. As invasive species go, they’re pretty innocuous, but still. National Geographic has a look at Florida’s chameleon hunters, who adopt out the chameleons they catch.
  6. Meanwhile, across the Straits of Florida, the Washington Post looks at an unlikely refuge for rare snakes like the Cuban Boa (Chilabothrus/Epicrates angulifer): Guantanamo Bay.
  7. A Manitoba couple caught a Plains Garter Snake (Thamnophis radix) in the act of gobbling down an Eastern Tiger Salamander (Ambystoma tigrinum). Small problem: the salamander’s endangered. That snake is in serious legal trouble.
  8. And what is almost certainly the weirdest reptile story ever to come to my attention: a story about turtle boners. No wait, it’s better than you think! It’s really difficult to figure out a turtle’s sex. So researchers came up with the idea of—oh boy—using a vibrator to stimulate the turtle: male turtles would get an erection. So: turtle boners. In the study, the method had a 100 percent accuracy rate. Because: turtle boners. Science is awesome. That is all. [Acta Herpetologica]

A Herpetological Roundup

Brown-snouted Blind Snake (Ramphotyphlops wiedii or nigriscens), November 13, 2015. Photo by Will Brown. Creative Commons Licence.

  1. Known from only a handful of specimens since its discovery in 1937 and feared extinct, the Albany Adder (Bitis albanica) was found alive and well—at least four specimens were—last November, in a South African location that is being kept secret to deter poachers. Because yes, poachers will collect the shit out of these snakes.
  2. The plan to reintroduce Timber Rattlesnakes (Crotalus horridus) to an island in the Quabbin Reservoir in Massachusetts has been suspended in the face of local opposition; the Worcester Telegram’s outdoors writer Mark Blazis is disappointed.
  3. Ontario Nature has announced its new and improved Ontario Reptile and Amphibian Atlas app, which isn’t so much an app as it is a mobile website that supports offline data. Anyway, it’s got a field guide and lets you enter species sightings.
  4. Fossil snakes are generally known from their vertebrae, which makes their study a little less exciting to the lay reader than dinosaurs; still, it’s rather exciting that a new extinct species, Zilantophis schuberti, has been described from a fossil found in eastern Tennessee. “Zilantophis bore uniquely broad wing-shaped projections on the sides of its vertebrae. In life, these were likely attachment sites for back muscles. These features are what inspired the name of the new genus, derived from Zilant, a winged serpent in Tatar mythology.” [Journal of Herpetology]
  5. Blind snakes (Scolecophidia) are tiny, secretive and easily overlooked; even so, there’s something of a blind snake renaissance going on, says Andrew Durso. “I recently noticed, much to my surprise, the the number of described species of blindsnakes has doubled in the last 13 years, from 305 in 2004 to 599 today; that’s 16.5% of all snakes! There are certainly many undiscovered species of blindsnakes, so it’s likely that their numbers will continue to grow.”
  6. A fascinating article in The New York Times Magazine from Daniel Engber that looks at the increasing use of the Burmese Python (Python molurus bivitattus) as a laboratory animal, and the possibility that its extraordinary digestive system—which has to flip from inactive to a 50,000-calorie meal all at once—may help find a cure for diabetes.

A Herpetological Roundup

Tuatara (Sphenodon punctatus), Willowbank Wildlife Reserve, New Zealand, Dec. 29, 2013. Photo by Flickr user _somaholiday. Creative Commons licence.

  1. Atlas Obscura on the comeback of the only remaining rhyncocephalian, the tuatara (Sphenodon). Breeding programs having more tuataras than they know what to do with is a nice problem to have. (I know people who, through zoo connections, have handled tuataras. I’ve never so much as seen one in the flesh.)
  2. Kenya has banned the export of various snakes, including the African Rock Python (Python sebae), due to the impact of collecting and poaching on wild populations. I would have thought that there wouldn’t be much demand, relatively speaking, for the large and nasty African Rock Python, but they’ve been collected so much that, like overfished species, their full-grown size in the wild has diminished. [via]
  3. A plan to reintroduce the Timber Rattlesnake (Crotalus horridus) to an island in the Quabbin Reservoir in Massachusetts is running into opposition from local residents, though the island is a more isolated and remote reintroduction site than just about any other alternative. [via]
  4. The discovery of a rattlesnake in a Texas home led to 23 more turning up in the cellar, where they’d been overwintering.
  5. Ceal Klingler writes about the time that a Panamint Rattlesnake (Crotalus stephensi) came by for a visit. [via]
  6. That Arizona bill allowing snakes to be shot within city limits — which I mentioned in my last roundup — has apparently passed.
  7. The Mexican Garter Snake (Thamnophis eques) is endangered in Arizona, so residents presumably still can’t shoot it. It was believed to have disappeared from the Colorado River system, but it was recently spotted near Lake Havasu City, which has wildlife officials scratching their heads a bit. [via]
  8. I knew about caudal luring — when a predator wiggles uses its tail (usually wiggling it) to attract prey — but this report of Puff Adders (Bitis arietans) using their tongues to do it is something else.
  9. Painted turtles (Chrysemys) don’t leave the water to hibernate, even when it freezes: they spend the winter under ice. How does that work? How do they breathe? The Nature Conservancy’s Cool Green Science blog explains.

A Venomous Roundup

Black-tailed Rattlesnake (Crotalus molossus), Little Ray's Reptile Zoo, December 20, 2008.

Black-tailed Rattlesnake (Crotalus molossus), Little Ray’s Reptile Zoo, December 20, 2008.

Some links on venom, rattlesnakes, and rattlesnake venom:

  1. In April, BBC Earth explored venom overkill — why are jellyfish, snake and other creatures far more venomous than they need to be, especially given the metabolic cost of producing venom? The answer is deceptively simple: “[t]here’s no such thing as absolute toxicity” — venom is tailored to specific prey that may have evolved resistance to it.
  2. Most North American rattlesnake venom lacks neurotoxins, but a recent study finds that their common ancestor did have the genetic ability to produce neurotoxic venom 22 million years ago. That ability has since been lost to specialization (see above): Western and Eastern Diamondbacks lost the ability to produce neurotoxins about six million years ago; Mojave Rattlesnakes, whose venom is neurotoxic, lost a myotoxin gene about four million years ago. [Science News]
  3. A 36-year study of a population of Timber Rattlesnakes in the Adirondacks found that female rattlesnakes waited, on average, until they were 10 years old before having their first litter, and that most had only one litter in their whole lives. This has serious conservation implications. [via]

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