A single male frog, alone in a museum tank, spent sixteen years yearning for companionship. When Romeo finally died last January—old age catching up with him—conservationists could have mourned the end of an era. Instead, they uncovered something far more remarkable: proof that his species had never truly vanished at all. In Bolivia’s misty cloud forests, another generation of Sehuencas water frogs thrives, carrying forward a legacy Romeo never lived to witness.
The Frog Nobody Expected to Find
Picture a creature small enough to rest in a human palm, with bulging golden eyes and skin the colour of mountain stone. This is the Sehuencas water frog—a fully aquatic amphibian that exists nowhere else on Earth except within the cool, fast-flowing streams of Bolivia’s Andean highlands. For nearly a decade, scientists feared it had vanished entirely.
Between 2009 and 2019, researchers knew of only one living Sehuencas water frog, a captive male nicknamed Romeo. He arrived at the Alcide d’Orbigny Natural History Museum in Cochabamba as a precautionary measure, extracted from Carrasco National Park where chytrid fungus—a pathogen that has devastated amphibian populations worldwide—was spreading rapidly. The researchers took Romeo to the museum as a precautionary measure. What nobody anticipated was that he would become the sole survivor of his kind, waiting in captivity whilst the world outside seemed to have forgotten he existed.
The Date That Captured Hearts
By 2018, conservation had become an urgent matter. Scientists partnered with Match.com to create a dating profile for Romeo, which raised over $25,000 in donations to fund searches for more Sehuencas water frogs. It sounds absurd—a frog’s profile on a dating website. Yet the campaign worked. The funds enabled herpetologist Teresa Camacho Badani and her team to venture into Bolivia’s remote cloud forests in search of what many believed was lost forever.
What they discovered exceeded all expectations. The team found five Sehuencas water frogs in a stream in Carrasco National Park in a different location from where Romeo had been captured. Among them was a female who would be named Juliet. When Romeo was introduced to her in captivity, something unexpected happened: the elderly male, silent for years, suddenly began to sing.
A Love Story That Couldn’t Be
Romeo displayed behaviours researchers had never witnessed before. He displayed previously unseen behaviours researchers dubbed “jazz hands” or “twinkle toes,” shaking his toes while in amplexus, the mating position where males cling to females during fertilisation. Yet despite their shared moments, despite Romeo’s renewed vigour, the pair never produced offspring. The two frogs lived contentedly together in captivity, but the reproduction that conservationists desperately hoped for never materialised.
Romeo eventually died in January 2025, sixteen years after he was first taken into captivity, from natural causes related to his old age. Juliet survived his passing, still living at the museum alongside the other frogs brought in from the wild. Their failure to breed felt like a setback, a chapter of disappointment in a much longer story.
The Timing of Transformation
But history had other plans. Around the time Romeo was nearing the end of his life, inspiration struck elsewhere in the Bolivian mountains. Camacho Badani and her colleagues followed a tip from Saul Altamirano, a botanist working in an area in Carrasco National Park about 62 miles from the stream where Juliet was discovered in 2018, and discovered a small but stable population in the area.
The implications were staggering. The team counted at least ten adults in the stream, both males and females, four juveniles and multiple tadpoles, suggesting that the population is successfully breeding in the wild. This was only the second population of Sehuencas water frogs found in the wild since 2009—a genuine miracle of conservation.
The Murky Business of Hope
Finding these frogs is less romantic than the Match.com campaign suggested. Camacho Badani says that the capture technique often involves placing your hands blindly into murky water. As she feels around, she sometimes captures a water frog or a tadpole. Other times, she’s rewarded with putting her hands around a footlong slug. The work is unglamorous, sometimes unpleasant, but absolutely vital. Researchers are now monitoring the new population using underwater recording devices, tracking the frogs’ natural calls without disturbing their behaviour.
A Species at the Crossroads
The rediscovered population lives in an environment still threatened by the same forces that nearly erased the species. The species remains critically endangered because of habitat destruction as a result of agricultural expansion, in addition to climate change, disease, pollution and the introduction of invasive exotic species to their streams. The IUCN Red List classifies this species as critically endangered with no more than 49 mature individuals alive at any one time.
Yet the discovery has reframed conservation efforts. Instead of relying solely on captive breeding programs, researchers can now focus on protecting wild habitat. Camacho Badani and others on the team are working with rangers and local communities in Carrasco National Park to study and protect the Sehuencas water frogs in the wild, which would also help safeguard other critically endangered species the frog shares its home with.
Legacy Written in Mountain Streams
Romeo’s story, though it ends without offspring, has become something more profound. He spent sixteen years in captivity, a reminder of how close species can come to oblivion. His companions—Juliet and the others housed in captive breeding programs—continue the work of ensuring genetic diversity and knowledge. But in those mist-covered streams of Bolivia, a population of Sehuencas water frogs lives free, unburdened by human hands or museum tanks.
The solitary frog who once represented the brink of extinction has become a symbol of resilience. Not his own—though that was genuine enough—but that of an entire species refusing to disappear without a trace. Somewhere in the cool depths of Carrasco National Park, young Sehuencas water frogs swim and call into the darkness, their survival owing much to a frog who never gave up hope, even when the world had nearly given up on him.
