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Roxanne Armfield

@dinoroxy.bsky.social

210 followers 430 following 64 posts

Squamate palaeontologist, currently working with numerous snakes at Yale University. 🐍🐍🐍 Frequently found conversing with rocks, fossils and other inanimate objects. (She/Her)

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Roxanne Armfield @dinoroxy.bsky.social · Dec 23

Hello Bluesky! I'm a palaeontologist & evolutionary biologist with a love of big systems,
🧬➕🥚➕🌿🏞️ = 🦎
big questions,
🦎➖🐾= 🐍
and big to-do lists.
📝
Frequently distracted by #SciComm, #Snakes and Shiny Things💎

Roxanne Armfield holding a blue-tongued skink: a brown-grey elongate lizard with a white belly and tiny limbs.

Roxanne Armfield looking out on the french Alps in the summer. Roxanne is in the foreground with grass-covered hilltops behind her. Further back are dark green mountains lightly covered by clouds.

A cute tan coloured corn snake, with red and black stripes and a beady black eye, looks out from a bundle of sawdust.

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Reposted by Roxanne Armfield

Luke Johnson @lukejohns.online · 2d

We've just set up a Bluesky for @nu-mechanobiology.bsky.social - give it a follow if you're in the #mechanobiology space!

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Reposted by Roxanne Armfield

Thomas R. Holtz, Jr. @arctomet.bsky.social · 7d

Benson, R.B.J., Walsh, S.A., Griffiths, E.F. et al. Mosaic anatomy in an early fossil squamate. Nature (2025). doi.org/10.1038/s415...

Mosaic anatomy in an early fossil squamate - Nature

Breugnathair elgolensis gen. et sp. nov., an early squamate identified from a newly discovered Middle Jurassic skeleton on the Isle of Skye, provides new evidence on the origins of snakes.

doi.org

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Reposted by Roxanne Armfield

Luke Johnson @lukejohns.online · 24d

More recent Luke news: I made some music and you can listen to it!

https://lukejohns.online/blog/bits_peaces/

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Roxanne Armfield @dinoroxy.bsky.social · 29d

📸 4. Alligator 🐊 Rodney Cammauf, U.S. National Park Service, Public Domain, commons.wikimedia.org/w/index.php?...

📸 5. Trainer Lauralea Oliver 🚶‍♀️ with Vector 🐕‍🦺, Public Domain, commons.wikimedia.org/w/index.php?...

Roxanne Armfield @dinoroxy.bsky.social · 29d

📸 2. Map 🗺️ NASA + Pfly, Public Domain, commons.wikimedia.org/w/index.php?...

📸 3. Snake 🐍 Rushen, Kaeng Krachan National Park, CC BY-SA 2.0, commons.wikimedia.org/w/index.php?...

📸 4. Deer 🦌 Ianaré Sévi, CC BY-SA 3.0, commons.wikimedia.org/w/index.php?...

Roxanne Armfield @dinoroxy.bsky.social · 29d

#SourceOfTheScience - Doi.org/10.1007/s10530-010-9908-3

#SourceOfTheScience - doi.org/10.1073/pnas...

📸 1. Snake 🐍 LiCheng Shih, CC BY 2.0, commons.wikimedia.org/w/index.php?...

📸 2. Cormorant 🐦 DarkNight0917, CC BY-SA 4.0, commons.wikimedia.org/w/index.php?...

Identifying plausible scenarios for the establishment of invasive Burmese pythons (Python molurus) in Southern Florida - Biological Invasions

Successful invasions of secretive alien species often go unrecognized until spread has exceeded the point where control or eradication is feasible. In such situations, understanding factors that contr...

Doi.org

Roxanne Armfield @dinoroxy.bsky.social · 29d

Removing a population of #InvasiveSpecies is difficult, and multiple methods will be needed.

If you live in Florida, what can you do if you spot a wild Burmese Python?
Note the location, take a photo and report it on: www.eddmaps.org/florida/

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EDDMapS

www.eddmaps.org

Roxanne Armfield @dinoroxy.bsky.social · 29d

Burmese Pythons are secretive, and have no natural predators in the #Everglades. This is why human intervention is vital.

Camera technologies, drones, scent tracking dogs, & even other snakes are all techniques being assessed on how well these methods can recover pythons.

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Right, trainer Lauralea Oliver, with Vector, a mottled black and tan Shepard dog (left). The dog holds a green crocodile plush toy in its mouth, and is wearing a red collar and a body sash which reads “Search Dog”. Lauralea Oliver is crouching down with her dog, and wears black fingerless gloves, a black sweater and a blue rucksack.

Roxanne Armfield @dinoroxy.bsky.social · 29d

The remains of white-tailed deer, alligators, 37 species of bird, & even bobcats have been found inside the stomachs of these hungry snakes.

So what is happening to prevent these snakes from causing irreversible damage?

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A white-tailed deer, facing to the right with the top part of its front legs and part of its body in the camera view. The deer has a light tan colour, with a white belly and occasional white streaks through its body. Its large, round brown eye has a white circle of fur around it. The deer’s nose is a darker brown, and its large oval ears are raised high, with slightly pointed tips.

The face of an American Alligator, in side view, fills the image. The Alligator has grey-blue scales covering its body. The teeth in its upper jaw are white, and exposed in an overbite, so they hang over the closed lower jaw. The alligator rests its head on the irregularly spiked tail of another alligator, which follows into the direct foreground and out of frame.

Roxanne Armfield @dinoroxy.bsky.social · 29d

Likely introduced through the exotic pet trade, the past 40 years have seen a dramatic increase in the number of invasive pythons spotted in the Everglades.

Alongside the rise in invasive pythons, the local mammal population has declined by over 90%.

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Foreground: A mottled tan and dark brown patched Burmese Python (Python molurus bivittatus) twists into the foreground. Its head is raised showing a pale underbelly and a round, black eye.

Roxanne Armfield @dinoroxy.bsky.social · 29d

But over in south Florida, these holiday-making #pythons have far overstayed their welcome. This has caused devastating environmental consequences in the #Everglades.

These pythons did not migrate to Florida on their own. This is a problem caused by humans.

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A double crested cormorant is present in the foreground. It is a large bird with half oval shaped black feathers. It has an elongate, slightly hook-ended beak, which is coloured yellow. Its eye is a solid black circle. The bird is perched on the side of wooden decking and is facing towards one of the waterways in the everglades. The surface of the water is covered in heart-shaped green leaves. The background shows a blue sky with fluffy clouds, with thickly clustered green bushes on the horizon.

A satellite map image of the state of Florida. The southern most tip of Florida is highlighted by a yellow border, marking the boundary of the Everglades protected area. The Everglades take up approximately one quarter of the landmass.

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Roxanne Armfield @dinoroxy.bsky.social · 29d

It's the 9th of #ssSnaketember and it's a day for looking at #InvasiveAlienSpecies

Burmese Pythons are native to India & southeast Asia. In these areas the #snakes have a #conservation status of 'vulnerable' on the IUCN Red List.

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#Herpetology #SciComm #snake

A Burmese Python (Python bivittatus) coiled across the left and middle of the image. The snake is dark brown, with tan streaks and a pale underbelly. The head of the snake is lifted up, with a black forked tongue slightly protruding from its face.

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Roxanne Armfield @dinoroxy.bsky.social · Sep 8

#SourceOfTheScience -
doi.org/10.1086/377052

#SourceOfTheScience - doi.org/10.1242/jeb.062539

📸3 Snake 🐍 Rushenb, CC BY-SA 2.0, commons.wikimedia.org/w/index.php?...

📸5 Snake 🐍 Darius Bauzys, CC BY 3.0, commons.wikimedia.org/w/index.php?...

Snake Bioacoustics: Toward a Richer Understanding of the Behavioral Ecology of Snakes | The Quarterly Review of Biology: Vol 78, No 3

ABSTRACT Snakes are frequently described in both popular and technical literature as either deaf or able to perceive only groundborne vibrations. Physiological studies have shown that snakes are actua...

doi.org

Roxanne Armfield @dinoroxy.bsky.social · Sep 8

Snake hisses tend to be high pitched, around the top F# of a piano (3,000+ Hz). This means that snakes cannot hear their own hiss!

This could explain why snakes do not appear to communicate with each other using sound.

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The head of a black and yellow snake (Natix natrix) on a sandy surface. The snake sticks out its black forked tongue. The snake has a large black, round pupil in a dark coloured eye.

Roxanne Armfield @dinoroxy.bsky.social · Sep 8

Most snakes can comfortably hear one octave above a piano “middle C” & two octaves below (80 - 600Hz).

This is a rather small range – young humans can hear sounds between 20 – 20,000Hz.

This small range means that, sadly, snakes are not big fans of modern music.

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Roxanne Armfield @dinoroxy.bsky.social · Sep 8

This contact allows the snake to "hear" the vibrations travelling through any surface that the snake lays its head on.
Snakes can also hear sounds that travel through the air - but they have a limited hearing range.

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A coiled reticulated python. The snake’s head rests on one large coil, with two coils in the background. The snake’s head is yellow with black outlined scales. The neck and body of the snake has an undulating black stripe, outlined in yellow scales. A slight rainbow iridescence is present on some scales.

Roxanne Armfield @dinoroxy.bsky.social · Sep 8

Humans, rabbits & other mammals (think fluffy critters) have 3 small ear bones that vibrate in response to sound.

Snakes have only one (the stapes/columella). Unlike in mammals, the ear bone in snakes is in contact with the jaw bones.

skfb.ly/6xGrP

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UMZC R3. 23/2 Python amethystinus - 3D model by Museum of Zoology (@MuseumofZoology)

Skull of a python (Python amethystinus), from the Zoology Museum, Cambridge. These are large constricting snakes, which squeeze the life out of their prey. They can swallow prey whole much bigger than...

skfb.ly

Roxanne Armfield @dinoroxy.bsky.social · Sep 8

“Hearing” is #ssSnaketember the 8th’s theme!

Whilst #snakes do not have external "sticky out" ears, they can still hear. It is a myth that snakes are deaf, however they do have some quirks in relation to their methods of hearing.

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#Herpetology #SciComm #Snake

In the style of a coloured pencil sketch: a green coiled snake bobs back and forward whilst leaning against a blue grand piano, with an open lid.

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Roxanne Armfield @dinoroxy.bsky.social · Sep 8

📸3. Snakes🐍: Bjørn Christian Tørrissen, bjornfree.com/galleries.html, CC BY-SA 4.0, commons.wikimedia.org/w/index.php?...

📸4. Snake🐍:Dr. Raju Kasambe, CC BY-SA 3.0, commons.wikimedia.org/w/index.php?...

📸5. Snake🐍:Augustus Binu, CC BY-SA 3.0, commons.wikimedia.org/w/index.php?...

Roxanne Armfield @dinoroxy.bsky.social · Sep 8

What’s Batesian Mimicry you cry? Check out an earlier #ssSnaketember post on the topic:
bsky.app/profile/dino...
🐍
#SourceOfTheScience - doi.org/10.1086/377052

📸1. Snake🐍: Vassil, CC0, commons.wikimedia.org/w/index.php?...

📸3. Snakes🐍: Rushenb, CC BY-SA 4.0, commons.wikimedia.org/w/index.php?...

Roxanne Armfield @dinoroxy.bsky.social · Sep 2

2nd of #ssSnaketember! Time for Batesian Mimicry!

"It's red & black, stay back!" - is what these snakes want you to think.

A Batesian mimic is another term for "a critter in disguise". These snakes have patterns that make them look like a more dangerous type of #snake

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#Herpetology #SciComm

A red and black banded snake (Atractus thirhedrurus) in an “S” shape. On a light coloured background

A black, red and white banded snake (Xenodon pulcher). Snake has a flattened nose (similar to a pig-snout). Snake is coiled around a person's hands.

The head and first coil of a red, black and white banded snake (Cemophora coccinea). Snake has a round, black eye. Snake rests on white sand.

Roxanne Armfield @dinoroxy.bsky.social · Sep 8

The Oriental Ratsnake lives in the same region as the King Cobra.

King Cobras are venomous but Oriental Ratsnakes are not.

It is possible that by growling, the Oriental Ratsnake is mimicking & pretending to appear like the cobra – an example of Batesian Mimicry.

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Two Oriental Ratsnakes balancing on their bodies to raise their heads upright (as if "standing"). The left snake is grey with a lightly coloured underbelly. The right snake is a mustard yellow colour. Both snakes face to the right and are resting on grey rocks.

Roxanne Armfield @dinoroxy.bsky.social · Sep 8

These pockets act as resonating chambers, removing the high-pitched sounds of the hiss & leaving a low pitched sound to be produced in the throat.

The Oriental Ratsnake has also been heard growling but it does not have throat pockets. Instead, it has to flatten its throat

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The head and neck of an Oriental Ratsnake. The snake is light brown with a cream underbelly. Irregular black stripes fall across the snake's face and along its underbelly. The snake has an orange eye with a circular black pupil, and its black forked tongue sticks out.
Snake is in front of an out of focus green forest background.

Roxanne Armfield @dinoroxy.bsky.social · Sep 8

In snakes, a growl is a special kind of hiss. Not all snakes have the physical requirements to growl.
Two snakes that do are the King Cobra & the Red Tailed Racer.
In these snakes, the throat is not just a straight tube - it is lined with pockets that extend into the body.

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A king cobra snake (Ophiophagus hannah) stands with its head raised and faces to the left. The rest of its body trails behind it into the distance and out of focus. The snake has light cream underbelly scales and light brown scales on its face. The scales on its face are bordered by dark brown detail.

A bright green snake (Red Tailed Racer snake) is coiled amongst a tree branch. The snake has triangular pointed scales, outlined in dark brown. The snake's head rests on one of its coils. The snake has a green eye with a large black, circular pupil.

Roxanne Armfield @dinoroxy.bsky.social · Sep 8

But let's set the record straight first - snakes rarely hiss. When they do, it is an entirely defensive move.
If a snake hisses around a human it's basically saying "here I am, don’t tread on me!"

They do not hiss when angry, nor to communicate with other snakes.

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a man is sitting in a chair talking on a cell phone while wearing sunglasses .

Alt: GIF from "Good Omens" TV Series. David Tennant wears all black. He wags his tongue and makes a hissing sound whilst talking on the phone. His body then transforms into multiple black dots which swarm and enter the mobile phone. The phone hovers in the air briefly before falling to the floor.

media.tenor.com

Roxanne Armfield @dinoroxy.bsky.social · Sep 8

The 7th #ssSnaketember is a day for Growling!
Even though many humans have never encountered a "real" #snake, thanks to film and TV, you will have probably heard a snake hiss.

But did you know that some #snakes can growl too?

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#Herpetology #SciComm

A king cobra snake (Ophiophagus hannah) coiled up. The snake has a light brown colour with its scales outlines in dark brown. Its head peeks over the top of a large coil. The snake rests on some fake moss on a tree trunk.

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