In May 2020, the World Health Assembly in resolution WHA73.1 requested the Director-General ofthe World Health Organization (WHO) to continue to work closely with the World Organisation forAnimal Health (OIE), the Food and Agriculture Organization of the United Nations (FAO) andcountries, as part of the One Health approach, to identify the zoonotic source of the virus and the routeof introduction to the human population, including the possible role of intermediate hosts. The aim isto prevent both reinfection with the virus in animals and humans and the establishment of new zoonoticreservoirs, thereby reducing further risks of the emergence and transmission of zoonotic diseases.

DON JOHANSON:In the remote past, more than three million years ago, a tinyfemale lived by a lake on the edge of the lush forests of Africa. She was partape, part human. She lived a brief life, but her story continues to unfold.By an extraordinary set of circumstances, she left tantalizing clues to herlife and our origins. Who was she and what can we discover about this earliestof our most ancient ancestors? We know she existed because we found these, herfossilized bones, in the very spot where she died all those years ago. Fossilslike these are so rare, that they're even harder to find than diamonds, butthey're the key to understanding our origins, knowing who our ancestors were,and how they lived. The human story begins in one of the most geologicallyfascinating places on the planet, the Great Rift Valley of Africa. It's anenormous split torn in the Earth's crust that runs from the forests of Tanzaniato the deserts of Ethiopia. In some places, the rift is thousands of feet deepand exposes the last fifteen million years of the Earth's history. I'm DonJohanson and over the last twenty years, I've been leading fossil huntingexpeditions in this remote part of Africa on the trail of our earliestancestors. The journey takes me and my team right down to the floor of theGreat Rift. It takes two days driving dawn to dusk, if our vehicles don't breakdown. But it's only in places like this where the fossils we're looking forcan be found. People often ask why we look in Africa for remains of ourearliest ancestors. Well, Charles Darwin had a pretty good answer to thatquestion over a century ago. When he observed the close similarities betweenhumans and modern African apes, he correctly concluded that we must have shareda common ancestor. Starting with the modern human skull, we can trace ourancestry back millions of years. And as we travel back in time, our ancestorslook less and less like us. They begin to resemble our closest relatives, theAfrican apes with their small brains. Fossil skulls like these help us unlockthe mystery of our past. And it is in Africa that the earliest human fossilsare found. Our team always camps here, at a place called Hadar, in Ethiopia,on the banks of the Awash River. The river is our lifeline in this otherwisewaterless place. After two days of bumping along dusty roads, there's awelcome peacefulness about the camp. The days quickly settle into the rhythmof expedition life. The local people are nomadic tribesman called the Afar.We've known them twenty years. This is their land and they allow us to comehere and help us in our search. Ever since I first came to Hadar, they'vetaken it up themselves to guard us personally, because this is also banditcountry. It's not the most comfortable place to work, but if you're a fossilhunter like myself, it's a dream come true. When I first came to Hadar, Irealized that this was exactly the place I was looking for. It's potential isabsolutely staggering. When I began to walk these gullies and valleys, I sawtons of fossils eroding out of these ancient geological strata. There's almostno vegetation, so the seasonal rains do most of the work for us, scouring thesurface, uncovering buried fossils. There are bones of every imaginablecreature, perfectly preserved in stone. But even here, human remains areincredibly rare. That's because the journey from a living creature to afossilized bone only happens under the most unusual conditions. I can make agood guess about how our earliest ancestor might have been preserved millionsof years ago. She wasn't killed by a predator, she died a natural death.Undiscovered by scavengers, her body simply sank into the soft sediments of thelake. There, lying undisturbed, her flesh slowly rotted away. Sand and gravelwashed in by heavy rains gradually covered the bones. Over the millennia,hundreds of feet of sediments built up, burying the bones deeper and deeper.Minerals from the sediments gradually replaced the calcium of her bones, almostmolecule by molecule, turning them to stone. Over the next few million years,she remained buried, but the movement of the Earth's crust, continuing toenlarge the Great Rift, brought her ancient grave closer to the surface. Thereshe lay until rains cut down through the Earth, and one heavy storm brought herto light again. Spotting such rare human fossils doesn't happen often. But wecan discover a great deal about our ancestors' world by looking for the moreplentiful remains of the animals that lived with them. As soon as we'resettled in, everyone is eager to see what this year's rains have washed outonto the surface. We're a team of Ethiopian and American scientists, and withus, some of the sharpest-eyed fossil-finders of all: the local Afar people.There's really no other way to find fossils, except to walk these exposuresday-in, day-out, hoping to find something interesting. Here, for example,there's just a canine of a hippo, and a very beautifully preserved molar of agiraffe. It's interesting that virtually every animal has its own diagnosticanatomy, it's own diagnostic features, so even from a single tooth like this,we can tell what kind of a creature it was, a good specimen that we'llcatalogue and bring back to camp. But how could hippos and giraffes live inthis harsh desert? It must have been a very different place three millionyears ago. All told, we've collected more than ten thousand specimens fromover a hundred species, everything from rodents to elephants. The clues totheir lost world lies scattered all over the ground. Although it's a seeminglyuninteresting piece of bone, if you look at details, you begin to see a numberof clues. For example, the shape of the tooth indicates that it was probablyfrom a pig, part of a lower jaw. But even more intriguing is a series ofindentations on the inside of the jaw. And if we look at them with a hand lenslike this, it's obvious that that bone was pushed in when it was fresh, andit's very likely that this pig, three million years ago, had wandered down to,say the edge of a river, and became dinner for some lucky crocodile. A pictureof our ancestors' world vanished world is beginning to emerge. Here's more ofthis elephant tusk that's eroded out down this slope, and here are both tusksof the elephant. And here are the upper molars. By keeping track of everyfossil we find, we can map out a world totally different from Hadar today. Thegeologists can help us, too. They sample ancient layers of the Earth that havebeen exposed in the Great Rift Valley. Geologist, Tesfaye Yemani, hasdiscovered that Hadar was wet and forested millions of years ago.


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DON JOHANSON:At the time of our earliest ancestors, this place was lush andgreen. Back then, there were rivers and lakes with communities of animalsliving in and beside the water. Here were the pigs and the elephants whosefossils we found. Deep in the forest lived the apes from which we andchimpanzees are descended. The lives of today's chimpanzees hint at our closekinship with the apes. Even though they have smaller brains than we do,chimpanzees have many human characteristics. They're highly social, they have asort of language, and they use tools. In the distant past, we shared a commonancestor with these chimps, so our earliest ancestor must have been part ape,part human. For well over a century, people have been fascinated by the searchto find the missing link, a creature that would bridge the gap betweenourselves and the primitive apes. It was always thought that the key featurethat separates us from the apes is intelligence. It was logical to think,then, that the earliest ancestors would have large brains. The argument goeslike this: the chimpanzee skull holds a brain three times smaller than modernman. If increase in brain size set us on the path from ape to human, it wasthought that the missing link should have first developed a big human-likebrain. Back in the heat of Hadar, following the trail of the missing link isgrueling work. The sun pushes the temperature to over a hundred degrees. Butthere's always an air of anticipation, because you never know what might be inthe next ravine. This is a fossil-finder's dream: a perfectly complete skullpartly concealed beneath a covering a sandstone. But it's not one of ourancestors, it's a baboon, a kind of monkey. In a century of fossil hunting,skulls have always been the prize. After all, if our earliest ancestor were alarge brained ape, a skull would be the perfect proof. But the story is like adetective thriller, full of false trails, never straightforward, and it can allchange unexpectedly, because from time to time a fossil is found that is sodifferent that it entirely turns the story of our origins upside-down. Thetrail began not with the skull, but with something totally unexpected. I wassurveying late one afternoon when we were out collecting some elephant teeth,and I looked down on the ground and found in a couple of pieces this kneejoint. At first, I thought it was just from a monkey, maybe a baboon, but itwent together in a way that didn't look like any monkey. If it wasn't amonkey's knee what was it? It looked vaguely human, but how could that be? Ineeded an expert opinion. Owen Lovejoy is an anatomist, part-time forensicscientist and an expert on animal locomotion. If anyone could tell me whatsort of creature that knee belonged to, he could. be457b7860

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