Jonathan Crowe

Map blogger. Science fiction and fantasy critic and writer. Snake whisperer.

Tag: lizards

Vancouver Island’s Invasive Lizards

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On 27 Sep 2021

In Reptiles & Amphibians

European wall lizards (Podarcis muralis) have invaded Vancouver Island. Traced to a release by a roadside zoo that closed down in 1970, the lizards’ island population is now estimated at between 500,000 and 700,000. While some people enjoy having the lizards around—we don’t have many of them in Canada—it’s still an invasive species capable of doing damage. “Hanke assesses the threat to B.C.’s ecosystems as ‘an eight, if not a nine.’ He worries for native species such as the sharp-tailed snake, the Pacific chorus frog and the northwestern alligator lizard. The wall lizard feasts on them all.”

A Herpetological Roundup

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On 28 Dec 2018

In Reptiles & Amphibians

  1. A new species of salamander, the Reticulated Siren (Siren reticulata), has been described: CNN, Earther, National Geographic. Found in the Florida Panhandle and Alabama, the three-foot aquatic salamander had a near-mythic status (it was known as the leopard eel) before a specimen was caught and identified. [PLOS ONE]
  2. A new genus and species of snake was found in the stomach of a Central American Coral Snake (Micrurus nigrocinctus). The coral snake was collected in 1976; a ten-inch snake was found in its stomach that did not match any known species, so into the museum collection it went. As it often does, it took until this year for said snake, now named Cenapsis aenigma (“mysterious dinner snake”), to be formally described. [Journal of Herpetology]
  3. But maybe those discoveries aren’t such good news for the species being discovered. An excerpt from Rachel Love Nuwer’s Poached, published this week at Wired, looks at the plight of the Earless Monitor (Lanthanotus borneensis). When a population of this secretive lizard was found in 2008, the article reporting the find was careful to omit exact the exact coordinates. That didn’t stop reptile collectors: as with many other newly discovered species and populations, the monitor soon turned up in collections and on online ads.
  4. The Wildlife Justice Foundation has issued a report on Operation Dragon, its two-year investigation into turtle and tortoise smuggling in southeast Asia, and the widespread corruption that enables it. National Geographic has coverage.
  5. Lonesome George, the last known Pinta Island Tortoise (Chelonoidis abingdonii), died in 2012, but his genome still has much to teach us: a comparative analysis of his genome with Aldabra Giant Tortoise (Aldabrachelys gigantea) explores the genetic factors in tortoises’ longevity, gigantism and immune response. [Nature Ecology & Evolution]
  6. Last August, a Leatherback Sea Turtle (Dermochelys coriacea) was spotted off the British Columbia coast: a rare thing, apparently.
  7. A taxonomic update regarding small burrowing snakes found in Mexico and the southwestern United States: a study earlier this year placed sand snakes (Chilomeniscus) and shovelnose snakes (Chionactis) under the same genus as ground snakes (Sonora). CNAH’s list has already been updated.
  8. The Center for Biological Diversity is suing the U.S. government for failing to protect the Northern Mexican Garter Snake (Thamnophis eques megalops) and the Narrow-headed Garter Snake (Thamnophis rufipunctatus). In 2005 the Center sued to force the government to grant endangered species status to the Mexican garter; both species were granted threatened status in 2014.

A Herpetological Roundup

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On 29 Dec 2017

In Reptiles & Amphibians

  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 News, Toronto 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: World Snake Day Edition

By

On 16 Jul 2017

In Reptiles & Amphibians

It’s been a while since my last roundup, so there’s a lot to tell you about.

  1. Amphisbaenians—sometimes called worm lizards, though they’re neither, nor are they snakes—are the weirdest reptiles. And the mole lizards (Bipes) of Mexico, known locally as ajolotes, are the weirdest amphisbaenians, because while most amphisbaenians are legless, Bipes has forelimbs. Just forelimbs. You don’t see them very much because they’re so fossorial, but herpetologist Sara Ruane managed to catch one on video last month. Yes, it’s real. National Geographic has more.
  2. Speaking of legs, snakes still have the gene to grow them—the so-called “sonic hedgehog” gene. [Current Biology]
  3. It was long understood that snakes use the ZW sex chromosome system: the ovum determines the sex; males are ZZ, females ZW. Only a recent paper found that boa constrictors (Boa constrictor) and Indian rock pythons (Python molurus) have XY chromosomes—the sperm cell determines the sex, as it does in humans. [Current Biology]
  4. Ontario is extending Highway 400 toward Sudbury—through the territory of the threatened Eastern Massasauga Rattlesnake (Sistrurus catenatus). This CBC News article reports on the precautions taken by work crews as they work in massasauga habitat. Meanwhile, Lethbridge’s rattlesnake hotline—yes, they have a rattlesnake hotline—had a busy start to the summer.
  5. Turtle mortality along a stretch of road near Long Point, Ontario was so bad that local residents decided to do something about it. And after taking in nearly 600 injured turtles this year (up from fewer than 400 for all of 2016), the Ontario Turtle Conservation Centre, just outside Peterborough, has declared a “state of emergency” : they’re simply overwhelmed. Here’s a 2010 video from the Toronto Zoo showing how to help a snapping turtle cross the road.
  6. A turtle found wandering the streets of Burnaby, British Columbia turned out to be a threatened Wood Turtle (Glyptemys insculpta), which is not native to B.C. Showing signs of metabolic bone disease, the turtle was almost certainly an escaped or released pet kept illegally; it’ll be sent to a wildlife sanctuary in Ontario.
  7. The Guardian has the story of New Zealand’s cobble skink. The undescribed species was down to a few dozen individuals before wildlife officials tried to capture as many as they could before their habitat literally washed away. The entire population may now reside at the Auckland Zoo, awaiting reintroduction.
  8. Snake fungal disease has been found in more than 30 species in North America. Now it’s crossed the Atlantic: researchers have detected both the fungus and the lesions in wild snakes in both Great Britain and the Czech Republic. [Nature]
  9. Meanwhile, to prevent the spread of a fungal disease found in salamanders, the Canadian government has prohibited the importation of foreign salamanders, which will have an impact on the lab supply and pet trades. [Canada Gazette]
  10. In the Great Lakes region there are all-female populations of mole salamanders (Ambystoma) that are hybrids of several related species, e.g. the Blue-spotted (A. laterale), Small-mouthed (A. texanum) and Eastern Tiger (A. mavortium) Salamanders. A new study suggests that these female hybrids reproduce in a thoroughly curious manner: by mating with males from all three species, taking roughly equal parts of the donor males’ genetic material from each—a process called kleptogenesis. There are science fiction writers who’d have a hard time coming up with this. [Genome Biology and Evolution]
  11. Do snakes hunt in packs? A recent paper suggested that Cuban Boas (Chilabothrus/Epicrates angulifer) hunting bats in caves exhibit behaviour consistent with coordinated hunting. But David Steen is skeptical. “Snakes swallow whole. So when would ‘pack’ hunting be good? Only when there are lots of resources; no competition. Bat cave may qualify,” Steen adds on Twitter. [Animal Behavior and Cognition]
  12. Are snake bites on the rise? CNN’s alarmist headline and article gets smacked down.
  13. A question I answered on Quora: Why do snakes use constriction?

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