They are not yet gone. But for thousands of species, the earth is already holding its breath.
A new review in Nature Reviews Earth & Environment confirms what conservationists have long suspected: over 10,000 species now sit on the precipice, listed as Critically Endangered by the IUCN, the final designation before vanishing from the wild altogether. Nearly 1,600 of these are thought to have fewer than 50 mature individuals remaining, reports Liz Kimbrough.
“It is surprising,” said study co-author Rikki Gumbs of the Zoological Society of London, “that more than 1,500 species… are estimated to have fewer than 50 mature individuals remaining in the wild, a large number of those plants.”
They span continents and taxonomic kingdoms—trees whose names will never be uttered again in their native tongues, obscure frogs whose calls now echo unanswered, orchids whose final bloom may have come and gone unnoticed. For some, like the vaquita porpoise or the Yangtze finless porpoise, statistical models estimate a better-than-even chance of extinction within a decade. Others may already be gone, their disappearance unrecorded, their fate sealed in silence.
There are patterns, and there are outliers:
- 77% of these species are clinging to increasingly fragmented habitats
- More than 96% live in just one country
- 56% of all critically endangered species have declining populations
- 16 nations—many of them island or coastal—hold the lion’s share of this burden: Madagascar alone shelters 670 species found nowhere else
- Hawai‘i contributes hundreds to the U.S. tally, with some islands seeing over half their native flora classified as critically endangered
The causes are familiar: Farming, logging, pollution, invasive species, climate change. House rats and feral pigs are among the top killers. Fish farming has replaced fish. Trees fall to soy and pasture. And warming temperatures are helping push even resilient species like the giant quiver tree over ecological thresholds.
Yet a requiem does not always imply finality. Since 1993, at least 24 species have been rescued from this very category.
“The good news,” Gumbs noted, “is that it’s within our power as humans to [save them].”
We know the places. We know the tools. We lack only the will.
Eons of evolutionary heritage hang in the balance.
“Once we lose a species,” said Gumbs, “it’s gone for good. Eons lost in the blink of an eye.”
If this is to be a requiem, let it also be a reckoning.
