Petra the hermit crab

@petrahermitcrab.bsky.social

The life and adventures of a 3D-printed terrestrial hermit crab (Coenobita clypeatus). Her interests include selfies, fun food, self-fabrication, and uploading novel experiences to her collective hive-mind.

Royal Gorge Bridge is the highest suspension bridge in the United States, straddling the Arkansas River. What a stunning view! …I suddenly have an urge to upgrade my shell with an emergency parachute and a Mars lander-style airbag. You know, just in case. 🌉🦀🐚

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A few hours south by car from Colorado Springs is the Great Sand Dunes National Park. The dunes are truly impressive! It was a bit disorienting because you feel like you can keep walking forever and make no progress. Also, it looks like a giant beach with no shoreline or ghost crabs. 🏜️🦀🐚

Scritch-scratch. Scritch-scratch.Scritch-scratch. Scritch-scratch. Scritch-scratch. Bild

Glen Eyrie Castle is an estate of a Civil War general who founded Colorado Springs. Despite being built in 1871, it already had a working intercom system! I bet that came in handy when guards had to alert the knights that the castle was under siege, and the number of hostile trebuchets in range. 🏰🦀🐚

Engineering 101: glass is not trebuchet-proof.The castle is now guarded by bighorn sheep. Watch your step when you’re on castle premises.

Hello from Colorado Springs, CO, on a trip with my human companion’s family! At the US Air Force Academy, I learned how to pilot a mini P-38 Lightning. The Chapel (pic #4) was hidden in a giant box (pic #3) for renovation…I get it, beautiful buildings and crabs need to hide in a shell sometimes. 🦀🐚

BildLockheed P-38 Lightning, not to be confused with p38 mutagen-activated protein kinase. The hermit crab-sized variant has a pilot’s seat on top of the right engine boom.BildNot my photo. Image source: https://en.wikipedia.org/wiki/United_States_Air_Force_Academy_Cadet_Chapel#/media/File:Air_Force_Academy_Chapel,_Colorado_Springs,_CO_04090u_original.jpg

Meet my new congeneric…colleagues? Comrades? Friends! The shiny violet dude (“Jet”) is Coenobita violascens, and the tan gal (“Terra”) is Coenobita pseudorugosus. I suspect they’re less adventurous than me, but they’re interested in making future appearances here. 🦀🐚🦀🐚🦀🐚

BildJet becomes very shiny under the right viewing angle. I’m jealous.

On to farm animals! Here you can see domesticated vertebrates. The Miracle of Birth center is a fascinating place where you get to see sheep and cows in the zoea stage. So weird how mammals seem to reproduce without eggs or ocean water…maybe they have a 3D printer organ behind their gonopores. 🐄🐑🪿🦀🐚

Hello there, beautiful butterfly! Possibly Caligo eurilochus (forest giant owl butterfly)? Fancy seeing a fellow member of pancrustacea. I also saw a live peregrine falcon and a dead, stuffed mammal of some sort (idk, gray wolf I think) 🦋🦀🐚

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After enjoying a mini donut and matcha latte, I discovered a toy store that had a surprising number of toy hermit crabs. The anatomical accuracy was disappointing though. My standards are possibly too high, but little human zoeae and megalopae deserve better! 🧸🦀🐚

Me: 10/10, peak, quintessential, ideal form of terrestrial hermit crab. Sure, I lack antennae and antennules, but that’s a limitation of the 3D printer and my digital version has them.7/10, one of the better specimens. Correct number of pereiopods but proportions feel off. The cheliped looks too straight. I’m getting the uncanny valley crab feeling.6/10 unless you’re meant to be an amputee crab. Then again, you’re a hand puppet so you literally get handled a lot, and maybe the limb loss is sadly realistic?OH GOD NO. Erect posture? Ovoid cephalothorax? Poop emoji for shell? Youre not even convincingly  bilateria! This is insulting. 2/10.

Catching up on overdue posts—here is the beautiful city of Duluth, Minnesota. I love the giant aerial lift bridge! I was hoping to catch a cargo ship go by, but did not have any luck. Maybe after my failed attempt at commandeering the USS Midway (back in April 22, 2026), I scared them all away. 🚢🦀🐚

I got to dip my pereiopods in the cold water. I was also hoping for a giant hairy Minnesota land crab to crawl out of the big cave in picture #2, but sadly I didn’t see one. Hey, they probably aren’t real, but in my expert opinion they’re slightly more plausible than Bigfoot or yeti. 🫈🦀🐚

Split Rock Lighthouse! The massive fresnel lens inside the lighthouse (picture 3 if you look closely) was so cool. If I can use a more powerful light source and some mirrors to make the light beam unidirectional, I wonder if I can set a swath of Wisconsin on fire (not that I want to do that). 💡🦀🐚

Au revoir, Montréal! Thanks for all the sightseeing and delicious food. As I digest some poutine before my flight, I’m still thinking about this one sculpture that looked like the Circle of Willis (picture 3)…it’s cool, but does a vascular neurologist or a neurosurgeon live there? 🇨🇦🧠🦀🐚

BildBildIn case you’re wondering, the circle of Willis is the network of blood vessels on the ventral side of the human brain.

The red of Saint George’s cross (used to represent England 🏴󠁧󠁢󠁥󠁮󠁧󠁿) and the white of French royal emblem were seen as symbolic of the Canadian people’s heritage. Then in 1921, King George V made red and white the official national colors of Canada, inspired by a red hermit crab in a white shell. 🇨🇦🦀🐚

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I explored the extensive burrow network dug by humans (which they call RÉSO, or the Underground City) as well as the World Trade Centre Montréal. The piece of the Berlin Wall was on display. I think I prefer the dark, humid, and cozy crab burrows. 🕳️🦀🐚

I got to watch the Notre-Dame Basilica’s spectacular light show. The cathedral is beautiful. I got carried away fidgeting with color editing in pics #4 and 5, while waiting for the show to start…I have no images from the light show itself because recording is not allowed, and I’m a good crab. 😇🦀🐚

Hello fellow meiura(picture 1), future hermit crab home(picture 2), assorted protostomes and deuterostomes(picture 3). There was also a photo of an Ecuadorian hermit crab…or at least I think you’re C. compressus. Some of my cousins in the Pacific are hard to tell apart. Poor guy needs a new shell.🦀🐚

Can you tell me what species you are? No? Okay.BildBildAre you from the west coast of the Americas? Then I’d be confident you’re C. compressus.

In case of ecosystem collapse, my plan is to re-pane the hexagons to make it airtight, and create a self-sustaining, closed ecosphere with artificial ocean for Coenobita species to survive the next mass extinction. Like this post, and I’ll reserve a spot in the basement freezer for your gametes. 🦀🐚