Instead, they are “PhD students of 25 with a digital camera, a digital audio recorder and solar panels”, according to Mandana Seyfeddinipur, head of the Endangered Languages Archive at London’s SOAS (School of Oriental Studies).

But what the roving linguists find is arguably up there with a lost Incan temple.

“They live with the communities for months at a time, and develop social relationships, and talk to them and record them, and then they come back and they give me this SD card,” Seyfeddinipur tells BBC Culture.

“I’m such a wimp, I get so teary when I first hold it, because possibly the only record that we have of this language is in this tiny SD card.”

Seyfeddinipur has been working with London’s Southbank Centre’s National Poetry Library to preserve words that would otherwise be lost.

“The doomsday linguistic view is that by the end of this century, in the next 85 years, we will lose 3,500 languages – half of the 7,000 languages that are spoken today will fall silent,” she says. “We’re losing languages at the same speed at which the world lost its dinosaurs at the fifth mass extinction.”

Although it’s a natural process – “people move somewhere, they give up their language and adapt another language, it’s the beauty of language that it’s a social tool,” she argues – it’s now happening at an unprecedented rate.

“Because of globalisation and urbanisation and climate change, this process has sped up beyond what we’ve ever seen.”

The newly launched Endangered Poetry Project aims to tackle that loss at another level. “Languages are dying out at an astonishing rate: a language is being lost every two weeks,” says the National Poetry Librarian Chris McCabe.

“And each of those languages has a poetic tradition of some sort, whether it’s written or aural – within that poetry will be all the different approaches and styles of writing poetry, as well as everything that poetry can tell us about those people: what they’re interested in; what their concerns are.”