Baby "Dragons" Hatch in a Cave in Europe News
(CNN) — Postojna Cavern, situated one hour'southward drive southwest of Ljubljana, Slovenia'south capital, is and so vast, it has its ain railway.
And yet, 1 of the cavern'due south main attractions is something at the other cease of the size spectrum -- and completely unique to Postojna.
Baby dragons!
Postojna is, during normal travel times, ane of Europe'south most visited surreptitious attractions.
It's been known to locals for centuries and has the graffiti, dated 1213 to prove it. Tourists began arriving in serious numbers afterward an inaugural 1818 visit by Franz I of Austria, Europe'southward terminal Holy Roman Emperor. About 35 million have followed in his wake.
It's piece of cake to encounter why. The cave is then large that a small train runs for the first two of its 24 kilometer network of subterranean chambers and tunnels.
The train line ends at the massive Congress Hall where the Milan Symphony Orchestra performed dorsum in 1930. From there a walking path goes through six geological strata, crosses a span over a chasm congenital by Russian prisoners during Globe State of war I and continues by cloak-and-dagger clifftops and gorges, spaghetti-sparse stalactites and flowstone defunction.
Journeying to depths of 115 meters (377 feet), at times it takes visitors through slits simply one meter wide.
And yet the real adrenaline rush is saved for coming face to face with the kooky creatures that are found in the Postojna cavern system and nowhere else on Earth.
Blind salamanders
Olms grow upwards to 25 centimeters in length.
Courtesy Postojna Cave D. D
Olms, or proteus anguinus in Latin, are blind salamanders, about 25 centimeters long, that never develop across their juvenile, watery phase.
Locals dubbed them baby dragons considering they were washed out of Postojna during floods and, every bit caves are the abode of dragons, surely these were their babies, correct?
Present, visitors tin run across them swimming among the rocks in a purpose-built aquarium deep inside the cave.
"Beautiful aren't they?" asks Mateja Rosa, a big olm fan, who works as Postojna's marketing and PR manager.
They are indeed. Almost toylike in appearance, they're also sometimes called human fish because -- despite living underwater -- they have pinkish-white, smooth pare instead of scales, and limbs with drawing-like fingers below their busy red gills.
They may be blind, simply the olms seem to hear the arroyo of visitors, apparently sensitive to vibrations. One even attaches itself to the drinking glass tank near to where my face is peering in.
Is it curious? Is information technology being friendly?
Not so, according to Primož Gnezda, a young, enthusiastic biologist who'south been studying these creatures for years.
"The olms in the cavern tank hear you, become frightened and assume their prophylactic positions," say Gnezda during a bout of the Vivarium, an exhibition space next to the cave that displays more olms and a slew of other Postojna creatures.
The apparently friendly olm is known for its unusual beliefs, but wasn't beingness gregarious.
"It e'er spreads against the glass for safety," says Gnezda. "That it appeared next to your face up was only a coincidence."
Table manners
Visitors to Postojna can see olms in an aquarium.
Jure Makovec/AFP/Getty Images
Co-ordinate to Rosa, olms can live to 100 years and can survive long periods without eating.
"Seven years for sure," she says. "For the starting time two - 3 years, no trouble. Afterward they first to lose weight, stop moving and just wait for prey to pass by. Any longer than 7 years and some may die, some may survive, depending on the individual'south metabolism."
When they practise find nutrient, we can forgive their manners.
"We feed them worms," says Gnezda. "The worms form a small ball together in the water and the olms come up and hoover it up whole like a vacuum cleaner. Sometimes they consume so violently that you lot tin can see worms coming out of their gills along with the h2o."
The Vivarium leads to the lab where scientists have a license to proceed x olms for enquiry. A lot of coin is spent on these creatures.
"Biologists accept been researching their Dna," says Gnezda. "Their genome is similar a novella. Information technology's 16 times longer than the man one and more complicated."
"You lot too have a lot of empty spaces. Nosotros don't know why they be. Imagine a book 600 pages long, where all the words are scrambled and we must reconstruct the story."
Is there a reason we're and then interested?
"Their regeneration power is astonishing. If they lose a limb, they regrow it. The thought of the research is to discover out the mechanism behind information technology."
"Non to actually grow back your arm or your leg, but maybe to produce a new human mitt or a leg from your own cells inside a laboratory and so graft information technology onto you. That's, of course, far, far into the futurity."
Mating trip the light fantastic toe
The olms tin live up to 100 years.
Jure Makovec/AFP/Getty Images
Given that the olms are cute, don't require feeding and they will probably outlive you, Rosa says that in the past they were sometimes given as pets to visiting dignitaries.
"Virtually died," she adds. "Olms must exist kept at around 13 Celsius (55 F). If the temperature rises quickly, say from 10C to 15C, it kills them."
Salamanders outset their lives in the water like olms but then they driblet their gills, develop lungs, walk on country and mature sexually; yet olms remain and multiply in the juvenile phase -- a biological oddity like their close relative the axolotl, also dubbed the Mexican walking fish.
Olms even have a mating dance.
"Information technology goes similar this," Gnezda says. "When the female person is ready, she'll come to the male. When he smells her, he'll start swimming in front end of her; she'll follow him and practice a few circles together.
"At one indicate the male person will leave a packet of semen on the floor. She'll option it up and store it in a pocket inside her. When an egg comes out, it'll be fertilized on its own."
And that'south not all.
"You can't tell whether an olm is male person or female from its Dna. Both male and female take the same chromosomes. Now we're trying to distinguish between sexes by analyzing their claret and checking the hormone ratios. It looks promising simply this is yet ongoing inquiry."
Hatching dragons
Biologist Primož Gnezda is among scientists studying the olms.
Jure Makovec/AFP/Getty Images
Now to the large announcement.
On Jan 30, 2016 1 female person started feeling very territorial and attacked the other olms if they approached her; to the delight of the researchers, they saw that she was guarding an egg.
Her companions were immediately removed and her tank was isolated. Infrared cameras revealed that she kept laying eggs for some other 8 weeks.
"She eventually produced 64 eggs," Gnezda says. "In nature the mother sticks the eggs on rocks, as at that place'south no real predator out there in the cave."
"But a lot can go wrong while the egg is developing and effectually two thirds of the young just die past themselves."
Exactly four months subsequently the first egg had been laid, the first baby baby dragon hatched. It thrust out, fell onto the bottom of the aquarium and then swam around precociously.
All in all 21 survived. Intriguingly, they're born with eyes which they go on for several years until skin grows over them and renders them blind.
And since June 2021 2 of those five-year-onetime olms are at present on brandish.
As Gnezda reveals during a tour of the Vivarium, they're not Postojna's only unusual occupant.
In that location are cavern crickets that eat their own limbs if they can't find whatever food; poisonous cave millipedes; slenderneck beetles whose wings have atrophied and fused on their abdomen; cavern shrimps, the olms' preferred snack; and the obligatory appalling spider -- since in that location are no flight insects inside the cave, spiders use their silk to weave cocoons rather than webs.
Talking of food, when the olms were flushed out to rivers by floods, did they e'er wind up on someone's dinner plate?
Yes, says Rosa. "Up until the 1980s you could discover them sold on the slab in the fish markets in Trieste."
And?
"They sense of taste like banal calamari. Or so I'm told."
Source: https://edition.cnn.com/travel/article/olms-baby-dragons-slovenia-postojna-cave-cmd/index.html
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