Technologies

Woolly mammoth extinction blamed on climate change, not human hunting

«This is a stark lesson from history and shows how unpredictable climate change is — once something is lost, there is no going back.»

About 4,000 years ago, the last majestic woolly mammoth roaming Earth vanished, and for decades, scientists believed the colossal ancestors of elephants went extinct because humans hunted them relentlessly. DNA analysis of the animals’ old stomping grounds, however, reveals a different story.

The likelier culprit, researchers now say, was rapid climate change that ultimately wiped out the creatures’ food supply. But besides solving the mystery of the disappearing mammoths, these findings may offer a glimpse into the fates of other species if our present climate crisis isn’t controlled.

«We have shown that climate change, specifically precipitation, directly drives the change in the vegetation — humans had no impact on [the mammoths] at all based on our models,» Yucheng Wang, a zoologist at the University of Cambridge and first author of the paper published Wednesday in the journal Nature, said in a statement.

Co-author Eske Willerslev, a fellow at the University of Cambridge and director of the Lundbeck Foundation GeoGenetics Centre at the University of Copenhagen, added, «This is a stark lesson from history and shows how unpredictable climate change is — once something is lost, there is no going back.»

These gentle beings that dined on grass and flowers lived alongside Neanderthals. While many encounters might have been peaceful, the animals were a hot commodity when it came to making fur coats, musical and artistic instruments and hearty meals. That’s because of their thick, chocolate-colored fur, their sturdy, enormous tusks and their huge size.

They weighed approximately 6 tons and stood about 13 feet (4 meters) tall — as Wang puts it, woolly mammoths could «grow to the height of a double-decker bus.»

«Scientists have argued for 100 years about why mammoths went extinct,» Willerslev said. «Humans have been blamed because the animals had survived for millions of years without climate change killing them off before, but when they lived alongside humans they didn’t last long and we were accused of hunting them to death.»

It makes sense that prehistoric people were suspected to be behind woolly mammoths’ eventual demise instead of climate change. These animals somehow withstood the Ice Age about 12,000 years ago — the fanciful Disney movie Ice Age has some thoughts on that — but the new study’s researchers decided to dig a little deeper.

Over a period of 10 years, Willerslev led a team in dissecting DNA fragments collected from the Arctic soil where mammoths were known to graze. The samples were collected over 20 years and analyzed using a method called DNA shotgun sequencing.

DNA shotgun sequencing is an indirect way to create genetic profiles without requiring a person or animal to physically be there. Instead of collecting genetic information from bones or teeth, the method sequences DNA from traces of urine or discarded cells. Scientists have also used this tool to track the movement of COVID-19 by creating DNA profiles from sewage remnants.

The researchers looking into ancient mammoths discovered populations of the enormous animals — uncovered using the sequencing method — were depleted at a rate consistent with the quick speed of climate change at the time. Willerslev says it was because «as the climate warmed up, trees and wetland plants took over and replaced the mammoth’s grassland habitats.»

«When the climate got wetter and the ice began to melt, it led to the formation of lakes, rivers and marshes,» he said. «The ecosystem changed and the biomass of the vegetation reduced and would not have been able to sustain the herds of mammoths.»

Wang also notes that prehistoric humans would’ve probably spent most of their time hunting animals much smaller and easier to capture than enormous woolly mammoths, suggesting their impact on the animals’ extinction was arguably smaller than intuitively thought.

Another important aspect of the findings, Wang said, is «we have finally been able to prove that it was not just the climate changing that was the problem, but the speed of it that was the final nail in the coffin — they were not able to adapt quickly enough when the landscape dramatically transformed and their food became scarce.»

Such speed is why the researchers naturally drew parallels between what happened back then and what appears to be in store for us now. For instance, our global temperature is rising so quickly that many countries’ former goal of limiting the increase to 1.5 degrees Celsius (2.7 degrees Fahrenheit) is now considered nearly impossible by the UN’s Intergovernmental Panel on Climate Change. That’s unless immediate, drastic measures are taken, they say.

«It shows nothing is guaranteed when it comes to the impact of dramatic changes in the weather,» Willerslav said. «The early humans would have seen the world change beyond all recognition. That could easily happen again, and we cannot take for granted that we will even be around to witness it.»

«The only thing we can predict with any certainty is that the change will be massive.»

Technologies

Today’s NYT Connections Hints, Answers and Help for May 24, #713

Hints and answers for Connections for May 24, #713.

Looking for the most recent Connections answers? Click here for today’s Connections hints, as well as our daily answers and hints for The New York Times Mini Crossword, Wordle, Connections: Sports Edition and Strands puzzles.

Today’s Connections puzzle has a fun variety of categories. The purple one appeals to my English major heart. Read on for clues and today’s Connections answers.

The Times now has a Connections Bot, like the one for Wordle. Go there after you play to receive a numeric score and to have the program analyze your answers. Players who are registered with the Times Games section can now nerd out by following their progress, including number of puzzles completed, win rate, number of times they nabbed a perfect score and their win streak.

Read more: Hints, Tips and Strategies to Help You Win at NYT Connections Every Time

Hints for today’s Connections groups

Here are four hints for the groupings in today’s Connections puzzle, ranked from the easiest yellow group, to the tough (and sometimes bizarre) purple group.

Yellow group hint: Goo-goo.

Green group hint: Not shirts.

Blue group hint: City that never sleeps.

Purple group hint: Acclaimed writers.

Answers for today’s Connections groups

Yellow group: Baby gear.

Green group: Kinds of pants minus «s.»

Blue group: New York sports team members.

Purple group: Black women authors.

Read more: Wordle Cheat Sheet: Here Are the Most Popular Letters Used in English Words

What are today’s Connections answers?

The yellow words in today’s Connections

The theme is baby gear. The four answers are bib, bottle, monitor and stroller.

The green words in today’s Connections

The theme is kinds of pants minus «s.» The four answers are capri, jean, jogger and slack.

The blue words in today’s Connections

The theme is New York sports team members. The four answers are Jet, Met, Net and Ranger.

The purple words in today’s Connections

The theme is black women authors. The four answers are Butler, Gay, Hooks and Walker.

Technologies

Today’s NYT Mini Crossword Answers for Tuesday, May 20

Here are the answers for The New York Times Mini Crossword for May 20.

Looking for the most recent Mini Crossword answer? Click here for today’s Mini Crossword hints, as well as our daily answers and hints for The New York Times Wordle, Strands, Connections and Connections: Sports Edition puzzles.

Today’s NYT Mini Crossword is a fun one, and now I’m singing the song from 1-Across in my head. Need some help with today’s Mini Crossword? Read on. And if you could use some hints and guidance for daily solving, check out our Mini Crossword tips.

The Mini Crossword is just one of many games in the Times’ games collection. If you’re looking for today’s Wordle, Connections, Connections: Sports Edition and Strands answers, you can visit CNET’s NYT puzzle hints page.

Read more: Tips and Tricks for Solving The New York Times Mini Crossword

Let’s get at those Mini Crossword clues and answers.

Mini across clues and answers

1A clue: «Pink ___ Club» (Chappell Roan hit)
Answer: PONY

5A clue: Instrument that might be made with a comb and wax paper
Answer: KAZOO

6A clue: How bedtime stories are often read
Answer: ALOUD

7A clue: On edge
Answer: TENSE

8A clue: Short Instagram video
Answer: REEL

Mini down clues and answers

1D clue: Less colorful
Answer: PALER

2D clue: Layer of the upper atmosphere
Answer: OZONE

3D clue: Totally pointless
Answer: NOUSE

4D clue: Hit a high note in a high place, perhaps
Answer: YODEL

5D clue: Kit ___ bar
Answer: KAT

How to play more Mini Crosswords

The New York Times Games section offers a large number of online games, but only some of them are free for all to play. You can play the current day’s Mini Crossword for free, but you’ll need a subscription to the Times Games section to play older puzzles from the archives.

Technologies

Want to Speak to Dolphins? Researchers Won $100,000 AI Prize Studying Their Whistling

The scientists studied a bottlenose dolphin community in Sarasota, Florida, uncovering evidence of language-like communications.

If any dolphins are reading this: hello!

A team of scientists studying a community of Florida dolphins has been awarded the first $100,000 Coller Dolittle Challenge prize, set up to award research in interspecies communication algorithms.

The US-based team, led by Laela Sayigh of the Woods Hole Oceanographic Institution, found that a type of whistle that dolphins employ is used as an alarm. Another whistle they studied is used by dolphins to respond to unexpected or unfamiliar situations. The team used non-invasive hydrophones to perform the research, which provides evidence that dolphins may be using whistles like words, shared with multiple members of their communities.

Capturing the sounds is just the beginning. Researchers will use AI to continue deciphering the whistles to try to find more patterns.

«The main thing stopping us cracking the code of animal communication is a lack of data. Think of the 1 trillion words needed to train a large language model like ChatGPT. We don’t have anything like this for other animals,» said Jonathan Birch, a professor at the London School of Economics and Politics and one of the judges for the prize.

«That’s why we need programs like the Sarasota Dolphin Research Program, which has built up an extraordinary library of dolphin whistles over 40 years. The cumulative result of all that work is that Laela Sayigh and her team can now use deep learning to analyse the whistles and perhaps, one day, crack the code,» he said.

The award was part of a ceremony honoring the work of four teams from across the world. In addition to the dolphin project, researchers studied ways in which nightingales, marmoset monkeys and cuttlefish communicate.

The challenge is a collaboration between the Jeremy Coller Foundation and Tel Aviv University. Submissions for next year open up in August.

Dolphins are just the beginning

Researching animals and trying to learn the secrets of their communication is nothing new; but AI is speeding up the creation of larger and lager datasets.

«Breakthroughs are inevitable,» says Kate Zacarian, CEO and co-founder of Earth Species Project, a California-based nonprofit that also works in breaking down language barriers with the animal world.

«Just as AI has revolutionized the fields of medicine and material science, we see a similar opportunity to bring those advances to the study of animal communication and empower researchers in this space with entirely new capabilities,» Zacarian said.

Zacarian applauded Sayigh’s team and their win and said it will help bring broader recognition to the study of non-human animal communication. It could also bring more attention to ways that AI can change the nature of this type of research.
«The AI systems aren’t just faster — they allow for entirely new types of inquiry,» she said. «We’re moving from decoding isolated signals to exploring communication as a rich, dynamic, and structure phenomenon — whish is a task that’s simply too big for our human brains, but possible for large-scale AI models.»

Earth Species recently released an open-source large audio language model for analyzing animal sounds called NatureLM-audio. The organization is currently working with biologists and ethologists to study species including carrion crows, orcas, jumping spiders and others and plans to release some of their findings later this year, Zacarian said.