On 6 January 2000, rangers in Ordesa National Park in the Spanish Pyrenees found a female wild goat lying dead beneath a fallen tree. Her name was Celia, and she was the last Pyrenean ibex alive anywhere on Earth. A tree falling in a forest is an ordinary event. A healthy population would have absorbed the loss without anyone noticing. Celia’s death ended a subspecies that had lived in those mountains for thousands of years.
What happened next made the Pyrenean ibex one of the most useful science stories a UK primary teacher can bring into the classroom. Three and a half years later, on 30 July 2003, a team of Spanish and French scientists produced a living clone of Celia using skin cells taken from her ear while she was still alive. The newborn breathed for a few minutes and then died. The Pyrenean ibex became the first extinct animal ever brought back through cloning, and the first to go extinct a second time.
This guide explains the Pyrenean ibex to children aged seven to eleven and provides teachers and parents with the curricular context to use it effectively. LearningMole is a UK educational platform providing curriculum-aligned teaching resources for primary schools, and this story maps directly onto the Year 4 and Year 6 science programmes of study in the UK National Curriculum. You will find the animal’s biology, the reasons behind its decline, a plain explanation of how the cloning worked, and a balanced framework for running a de-extinction debate with a KS2 class. [Internal link placeholder: primary science resources hub]
The Pyrenean ibex was a wild mountain goat that lived in the Pyrenees, the range of mountains separating Spain and France. Its scientific name was Capra pyrenaica pyrenaica, and Spanish speakers called it the bucardo. It was one of four subspecies of the Iberian ibex, a wild goat found only on the Iberian Peninsula.
Subspecies can confuse children, so it helps to give them a comparison they already know. A Labrador and a whippet are both dogs, but nobody would mistake one for the other. The four Iberian ibex subspecies worked the same way. All four were the same species of wild goat, yet each had adapted to a different corner of Spain and Portugal, and each looked and behaved slightly differently as a result.
Two of those four subspecies are still alive today. Two have gone.
The Four Subspecies of Iberian Ibex
| Subspecies | Where It Lived | Status | What Makes It Distinct |
|---|---|---|---|
| Pyrenean ibex (bucardo)The | Pyrenees mountains, northern Spain and southern France | Extinct since 2000 | Heavy, thick horns curving outwards and back; the only subspecies ever cloned |
| Portuguese ibex | Northern Portugal and Galicia | Extinct since 1892 | Smallest of the four; disappeared over a century before the bucardo |
| Western Iberian ibex (Gredos) | Sierra de Gredos, central Spain | Alive | Recovered from very low numbers; the most widespread subspecies today |
| Southeastern Iberian ibex (Beceite) | Eastern and southern Spain | Alive | Thinner, more upright horns than the Pyrenean ibex |
Male bucardos were built for showing off. Their horns were thick, heavily ridged and could reach around 75 centimetres, curving outwards and then back over the shoulders. Each year of a male’s life added a new ridge, so counting the ridges gave a rough estimate of his age, in the same way that counting tree rings does. Females carried much shorter, straighter horns and, seen from a distance, looked more like a deer than a goat.
Their coats changed with the seasons. In summer, males wore a pale grey-brown coat marked with black patches on the forehead, mane and forelegs, while females were plain brown with no black at all. Winter brought thicker, longer hair, and the males’ black markings faded into a more uniform grey. Kids born in spring shared their mother’s brown coat for their first year before developing adult colouring.
They ate plants, switching between grazing on grass and browsing on shrubs and tree leaves depending on what the mountain offered that season. Fat stored around the kidneys carried them through winter when food was scarce. Females gave birth to one or two kids, usually in May, after a roughly five-month pregnancy, and mothers grouped together with their young, while adult males lived apart for most of the year.
Celia was a female Pyrenean ibex captured by Spanish biologists in Ordesa National Park in 1999, fitted with a radio collar and released. She was thirteen years old and, as far as anyone could tell, the only Pyrenean ibex left alive. She died on 6 January 2000 beneath a fallen tree.
The decision that mattered came before her death. When biologists from the Aragón regional government captured her in 1999, they took small skin samples from her ears and froze them in liquid nitrogen. There was no cloning plan in place at that point. They preserved the cells because it seemed sensible to preserve something, and because once she was gone, there would be nothing left to take.
That is worth sitting with in a classroom. Children usually assume that scientific discoveries begin with a plan. This one began with a group of people who saw that a subspecies was about to disappear and acted without knowing what, if anything, the samples would ever be used for.
By the time Celia was collared, the population had been in trouble for well over a century. Fewer than 100 bucardos survived by 1900. Numbers stayed under 40 for the rest of the twentieth century and never recovered. A management plan finally arrived in 1993, by which point roughly ten animals remained. Conservation had come too late to matter.
Hunting drove the decline, and competition with farm animals stopped any recovery. Neither cause worked alone, and this is the point most short accounts of the story miss.
Bucardos were hunted for meat, hides and above all for those horns, which trophy hunters prized. Sustained hunting throughout the nineteenth century reduced the population from a healthy size to a remnant. Spanish law offered the species protection from 1913, but by then the numbers were already too low.
The second pressure was quieter and harder to legislate against. Domestic sheep, goats, cattle and horses grazed the same mountain pastures the bucardo depended on. Livestock ate the plants the ibex needed, carried diseases the wild population had no resistance to, and occupied the ground the herds would have used to rebuild their numbers. Even with hunting stopped, the mountains could no longer support a recovery.
A very small population then faces problems of its own. With so few animals left, close relatives breed together, which reduces the genetic variety a population needs to stay healthy. Scientists are still uncertain about exactly how each factor contributed, partly because the subspecies died out before anyone could study it properly.
There is a teaching point here that suits Year 6 particularly well. Children often picture extinction as a single dramatic event, an asteroid or a hunter with the last animal in his sights. The bucardo shows the more common version: a slow squeeze from several directions at once, over generations, until a random falling tree finishes what people started.
Scientists used a technique called somatic cell nuclear transfer, which involves taking the instructions from one animal’s ordinary body cell and inserting them into another animal’s egg cell. The same method had produced Dolly the sheep in 1996.
Every cell in an animal’s body carries a full set of DNA, the instructions for building and running that particular animal. Celia’s frozen ear cells each held a complete set of bucardo instructions, even though the animal they came from was dead.
The analogy that lands best with a KS2 class is an instruction manual. DNA tells a cell what to build and in what order, the way a manual tells you how to assemble a piece of furniture. Freezing Celia’s skin cells preserved a complete copy of the bucardo manual. What the scientists did not have was any way to check whether every page had survived the freezer in perfect condition.
The team removed the nucleus, the part of the cell holding the DNA, from a domestic goat’s egg cell and replaced it with a nucleus from one of Celia’s frozen skin cells. That reconstructed egg was given a small electrical pulse to start it dividing, then implanted into a surrogate mother, a hybrid of a domestic goat and a Spanish ibex.
The numbers show how difficult this is. The team created and implanted 154 cloned embryos. Five surrogate mothers became pregnant. One pregnancy reached term. On 30 July 2003, a female Pyrenean ibex was delivered by caesarean section, alive.
Children find the arithmetic more persuasive than any adjective. One birth from 154 attempts is the honest picture of cloning, and it is a useful counterweight to the version they meet in films.
The cloned bucardo died within minutes of birth because one of her lungs had not formed properly. She had an extra lobe on her left lung, which left no room for the lung to inflate. She could not breathe.
Everything else about her appeared healthy. The DNA had worked. The pregnancy had worked. A single developmental fault in one organ ended it, and defects of exactly this kind are common in cloned mammals across every species anyone has attempted.
Why cloning produces these faults is still not fully understood. Part of the answer involves chemical markers on DNA that switch genes on and off at the right moments during development. In a normal pregnancy, those markers are reset naturally. In cloning, they are inherited from an adult cell that has already settled into being skin, and the reset does not always happen cleanly. Returning to the instruction manual analogy, all the pages were present, but some of the assembly steps were followed in the wrong order.
Ask a class what “extinct” means now. If one animal existed for seven minutes in 2003, was the Pyrenean ibex extinct or not? The answer that satisfies scientists is that a species needs a breeding population, not an individual. Even a healthy clone of Celia would have been a single female with no males of her subspecies anywhere on Earth. She could never have produced a Pyrenean ibex population.
De-extinction splits scientific opinion, which is precisely what makes it good classroom material. There is no settled answer for children to look up, so they have to reason it out.
Set the debate up properly, and a Year 5 or Year 6 class will produce arguments you had not anticipated. Give them the two sides first, then let them add their own.
De-extinction: The Arguments on Both Sides
| Arguments For | Arguments Against |
|---|---|
| Humans caused most recent extinctions, so we carry a responsibility to repair the damage | The money could protect species that are still alive and still savable |
| Techniques developed for de-extinction also help the conservation of endangered species today | A cloned animal has nowhere to live if its habitat is gone or occupied |
| Restoring a lost animal could repair a habitat that depended on it | Very few individuals means very little genetic variety and a fragile population |
| The science teaches us how development and inheritance actually work | Believing extinction is reversible might make people careless about preventing it |
The strongest question to put to a class is the habitat one. If scientists cloned a hundred healthy bucardos tomorrow, where would they go? The Pyrenean pastures that the subspecies needed are grazed by livestock and have been for two centuries. Children usually arrive at this themselves once prompted, and it moves the discussion from technology to the harder question of what an animal actually needs to survive.
Keep the classroom stance on inquiry rather than conclusion. Pupils should leave able to argue both positions, not repeating a view an adult handed them.
This story fits three separate strands of the KS2 science programmes of study, which is unusual for a single case study and makes it efficient to teach. It works in Year 4 for environmental change, and in Year 6 for both classification, evolution and inheritance.
Curriculum Mapping for KS2 Science
| Year Group | Programme of Study | How the Pyrenean Ibex Fits |
|---|---|---|
| Year 4 | Living things and their habitats: environments can change, and this can pose dangers to living things | Livestock grazing changed the mountain habitat; the ibex could not adapt fast enough |
| Year 6 | Living things and their habitats: classifying living things into broad groups by observable characteristics | Species, subspecies and the four Iberian ibex varieties give a concrete classification example |
| Year 6 | Evolution and inheritance: offspring vary and are not identical to their parents | A clone is the exception that proves the rule, and children grasp variation faster by meeting a case where it was deliberately removed |
| Year 6 | Evolution and inheritance: Animals are adapted to suit their environment | Seasonal coat changes, hoof structure and fat storage are all visible adaptations to mountain life |
The extinction and endangerment distinction causes more confusion in primary classrooms than almost anything else in this topic. Children use the words interchangeably. The bucardo gives you a clean way to separate them because the story includes an endangered population, an extinct subspecies, and two surviving relatives all at once.
A word on handling the death of an animal with a name. Celia’s story is genuinely sad, and children between seven and eleven will feel it. That is not a problem to design around. Give the feeling somewhere to go by moving the class towards agency: what would have needed to happen differently, and which animals alive today are in a similar position now. Sadness that leads to a question is doing useful work.
“Children can handle sad stories in science far better than adults expect, provided the lesson does not stop at the sadness. Ask them what they would have done differently in 1900, and you turn a story about loss into a lesson about choices,” says Michelle Connolly, Founder of LearningMole and former teacher with over 15 years of classroom experience.
Pair the topic with British species to bring it closer to home. The Scottish wildcat, the hazel dormouse and the red squirrel all face the pressures that finished the bucardo, which lets pupils apply what they have learned to animals they might actually see.
LearningMole produces curriculum-aligned video resources and teaching materials for UK primary schools, covering the science topics this story connects to. Our resources are created by experienced educators and aligned with National Curriculum objectives for each year group.
The bucardo works best as a case study within a broader unit rather than as a standalone lesson. Teachers covering Year 6 evolution and inheritance can use it to introduce variation before moving to fossils and adaptation. Teachers covering Year 4 habitats can use it as a worked example of how environmental change can cause harm.
Ready-made resources save time on planning, particularly for a topic like this, where the underlying science needs to be simplified without becoming inaccurate.
Children who like animals tend to find extinction stories gripping, and the bucardo gives you a natural route into how inheritance works. Watch a short video together, then ask your child to explain the difference between a clone and a sibling. If they can do that in their own words, they have understood something that many adults have not.
Curious children usually want to know what else has recently gone extinct. The dodo and the quagga are the natural next steps, and both connect back to the same human causes.
Split the class into small groups. Each group chooses an extinct animal and prepares a two-minute case for why theirs should be brought back first, covering three points: what the animal was, why it disappeared and where it could live today. The habitat requirement does the teaching, because it forces pupils to research whether a suitable environment still exists. Groups then vote, and no group may vote for itself.
Access to LearningMole’s video library gives teachers and families curriculum-matched science content across KS1 and KS2.
Yes. There are no living Pyrenean ibex anywhere in the world. The last wild individual, Celia, died in January 2000, and the single clone born in July 2003 survived only minutes. Two related subspecies of the Iberian ibex are found in Spain: the Gredos ibex and the Beceite ibex, but neither is a Pyrenean ibex.
The subspecies went extinct the first time when Celia, the last living bucardo, was killed by a fallen tree on 6 January 2000. It went extinct a second time on 30 July 2003, when the cloned female produced from Celia’s preserved cells died a few minutes after birth. No other species has been recorded as going extinct twice.
Celia was the last of her kind, and the skin samples taken from her ears in 1999 were the only source of living Pyrenean ibex cells anyone had. Without that decision to freeze her cells before she died, no cloning attempt would have been possible. Her cells remain preserved, so future attempts are not ruled out.
No. DNA breaks down steadily after an animal dies, and after roughly a million years, too little remains to be readable. Dinosaurs died out around 66 million years ago, so their DNA is long gone. Celia’s cells worked because they were frozen while she was alive, and even then, the attempt produced one short-lived birth from 154 embryos.
Yes. The Pyrenean ibex fits the Year 4 living things and their habitats and the Year 6 evolution and inheritance strands of the UK National Curriculum. Children aged seven to eleven can follow the story, and the science of cloning is well simplified through an instruction manual analogy. The death of a named animal needs sensitive handling, particularly with younger pupils.
An endangered animal is still alive but at serious risk of dying out, while an extinct animal has none of its kind left anywhere. The Pyrenean ibex was endangered throughout the twentieth century and became extinct in 2000. Endangered species can still recover, which is why the distinction matters when children are learning about conservation.
Cloning frequently produces developmental faults because the DNA comes from an adult cell that has already specialised into a particular job, and the chemical switches controlling development do not always reset properly. The cloned bucardo had an extra lobe on her left lung that prevented her from breathing. Similar defects appear in cloned animals across many species.
LearningMole provides curriculum-aligned videos and teaching materials on habitats, adaptation, evolution and inheritance for KS1 and KS2. Our science resources match the National Curriculum programmes of study and are designed for both classroom use and home learning.
The Pyrenean ibex disappeared in stages rather than all at once. Hunting reduced a healthy mountain population to a remnant throughout the nineteenth century; livestock grazing removed any route back; and by 1993, only about ten animals remained in a single Spanish national park. When a tree fell on Celia in January 2000, the outcome had been settled decades earlier by the choices people made about how the Pyrenees would be used.
The cloning attempt that followed deserves neither the celebration nor the dismissal it usually gets. A team took frozen skin cells from a dead animal and produced a living newborn from an extinct subspecies, a real scientific achievement. That newborn lived seven minutes, from 154 embryos, and could never have started a population even if her lungs had formed correctly. Both facts are true at once, and holding both is exactly the kind of thinking a Year 6 class should be practising.
For teachers and parents, the value of this story lies in what it makes children ask. It gives them extinction, adaptation, classification, inheritance, and human impact in a single narrative they will remember, and it leaves them with a genuine open question about whether de-extinction is worth pursuing. LearningMole’s curriculum-aligned science videos and teaching materials support the topics this story touches across KS1 and KS2, for classroom teaching and home learning alike.
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