Almost everything we eat is technically processed, from bread and Greek yogurt to canned tomatoes. But there’s a big difference between foods that are processed for convenience and ultra-processed foods, which have become a growing focus for health experts.

A smooth stingray attempts to prey upon a group of defenceless, freshly moulted spider crabs, while newly hatched marine iguanas race for their lives, attempting to outrun deadly racer snakes from the moment they emerge from the sand.

A leopard’s kill is threatened by a hungry hyena, while a hotrod ant faces a deadly antlion trap. Witness unforgettable moments in Africa’s wilderness.

Demoiselle cranes brave Himalayan winds and golden eagles, while highly venomous sea snakes hunt in groups of up to 30 across an exposed Indonesian coral reef.

Sir David Attenborough is continuing to produce nature documentaries at 100 years old. Hear from the programme makers at the heart of Blue Planet III and find out how they uncovered the secrets of the natural world. In this preview we see how they managed to capture an octopus’s lucky escape and what it took to get that perfect shot.

For UK audience, Blue Planet III starts on Sunday 1 November, 8pm, BBC One and iPlayer.

Huge crowds have flocked to a canal in South Korea to watch a stranded shark.

Bukangi was first spotted in the waterway last month in the south-eastern city of Busan.

Now a third attempt has been made to rescue the female using nets to guide her back to the open sea.

The BBC's Seoul correspondent Jake Kwon has been in Busan to follow the latest attempt to rescue Bukangi.

It's emerged that some of Europe's biggest fish farmers are now using poultry by-products to feed their salmon.

Two seafood suppliers have reportedly already started - and two more are preparing to, prompted by fishmeal prices almost doubling in the past two years. And chicken-fed salmon could soon be part of your weekly shop too.

From coastlines to open waters, discover the remarkable stories of animals that shape our natural world.

A hungry cub pushes its mother lioness into a dangerous face-off with a warthog, while a fish that hunts pigeons takes advantage of their lack of fear...

As a swarm of locusts devours everything in its path and a colony of army ants rampages through the forest, discover nature’s tiny terrors in all their extraordinary and destructive power.

The number of people developing dementia worldwide each year could more than double by 2050, according to a new study. Researchers project that annual cases will rise from nearly 11 million in 2023 to almost 25 million by 2050, largely driven by ageing populations. Alzheimer's disease accounts for up to 70 percent of dementia cases, while scientists estimate that a significant proportion could be prevented or delayed by addressing risk factors such as high blood pressure, diabetes, smoking and hearing loss. Women face a higher risk of developing dementia, and low- and middle-income countries are expected to experience particularly sharp increases. Dr Ivan Koychev, a neuroscientist and Clinical Associate Professor in Neuropsychiatry at Imperial College London, tells Al Jazeera that managing cardiovascular health, staying physically and socially active, and maintaining intellectual engagement can help reduce the risk. He also explains the possible role of hormonal changes in women's increased risk, identifies early warning signs such as memory loss and changes in thinking, and stresses the importance of seeking medical assessment when symptoms appear.

Why do living things almost always use just one version of certain molecules, while the mirror-image version is largely absent from nature? It's a question that puzzled scientists for more than a century. This year's Chemistry Nobel goes to two researchers whose work helped explain that mystery and opened new possibilities for developing safer and more effective medicines.

Driven by hunger, this octopus ventures onto land in search of her next meal, leaving behind the very water she needs to survive. Under the scorching summer sun, what begins as a clever hunting strategy quickly turns into a fight for survival.

Cities are expanding faster than any habitat on Earth, yet they offer unexpected opportunities for wildlife to adapt and thrive. How has Singapore created an urban world where humanity and nature can flourish together?

Tiger sharks in the Bahamas have led scientists to one of the biggest seagrass habitats on Earth. But why is seagrass so important?

Seagrass may look unassuming, but these underwater meadows play a powerful role in supporting marine life and tackling climate change. James Stewart investigates how, as these vital habitats disappear, scientists and communities are finding new ways to protect and restore them around the world.

Every step you take creates tiny electrical signals inside your bones. You’ll never charge your phone with them, but they may help tell your skeleton where it needs to grow stronger.

What's going on with the plague? Is a new pandemic starting in Russia? Today we're breaking down what the plague even is, whether it's a lab leak or potential bioweapon story, and how worried you should actually be.

Your garden could be doing more for the planet than you realise. By giving nature more space to do its own thing, we can help boost biodiversity, create healthier ecosystems and improve our own wellbeing too.

Only one third of plants in US gardens are native. To help change that, Nurture Nature co-founder Esther Bonney explains how restoring native biodiversity supports local wildlife and strengthens ecosystems.

Eight endangered orangutans have been released into a protected forest in Indonesia's Borneo after wildfires destroyed their original habitat. Rescuers cheered them on as they made a return to the wild after receiving medical care.

A plague scare in Siberia has become a Rorschach test for public health fears in a post-Covid world.

Russian officials are investigating the death of a worker at a plague research laboratory. They say she died of pneumonia. But speculation online has suggested she may have died from pneumonic plague. Russian authorities deny this and say there is no risk of an outbreak.

So why has the story sparked so much alarm? And how has the legacy of the Covid pandemic played into people's fears of another global health crisis?