The wild capture and release of a female big cat into a nature reserve is the first step towards reintroducing a population that hasn’t been seen for 70 years

On 31 July, “Umit” – which means hope in Kazakh – was released into a nature reserve on the edge of Lake Balkhash after more than a decade of careful planning to return the caspian tiger to the region. With this release, Kazakhstan became the first country to restore its tiger range after they had been thought extinct, with the last reliable sighting in the country recorded more than 70 years ago.

Umit – a wild-caught female tiger transported from the Russian far east – will be joined by more big cats in the coming years, with plans to establish a self-sustaining population of about 50. A wild-caught male flown from Russia is still being monitored by authorities and will be released when he is judged fit to survive alone. Two wild tiger cubs are also being reared on the reserve in special enclosures, with as little human contact as possible, and are likely to be released into the marshlands next year, to feast on boar, deer and kulans, a type of wild donkey.

In this week’s newsletter: the archipelago at the centre of the extreme weather phenomenon could help scientists predict how other marine ecosystems will adapt to our warming climate

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The ocean waters around the Galápagos Islands are hot. Very hot. Observed for centuries in the Pacific by fishers, the El Niño weather phenomenon begins when the prevailing trade winds slow, allowing warm water to spread east along the coast of South America. Right now, the pattern is in full flow and will build from this year into next, likely bringing record temperatures to an already overheating world.

If 2026 is not the hottest year on record, 2027 surely will be – and the Galápagos archipelago is in the centre of this climate crisis.

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For more than two decades, Pardington has been photographing taonga (Māori cultural treasures) and natural history specimens in museums around the world. In the South Canterbury museum, she was struck by a collection of stuffed native birds which had been subject to taxidermy – many of them now extinct or endangered. They inspired a new human-scale portrait series of these manu (birds), revered within Māori culture as intermediaries between human and divine worlds. The resulting works will be exhibited at the 2026 Venice Biennale.

Pardington invites viewers to reconsider how they think of birds, and how we might better protect them

• Fiona Pardington: Taharaki Skyside will be exhibited at the Aotearoa New Zealand pavilion at the Venice Biennale from 9 May – 22 November 2026

Colossal Biosciences’ CEO says its work follows a ‘moral obligation’ while critics say it’s ‘tech bro’ hype that could undermine conservation

Can and should we resurrect animal species that have been extinct for thousands of years? Such weighty, existential questions were once the preserve of science fiction but are now being played out within an unassuming brick building in a Dallas business park.

Colossal Biosciences, valued at $10.2bn after raising hundreds of millions of dollars in funding from investors including celebrities spanning from Tiger Woods to Paris Hilton, has provoked a stampede of acclaim as well as denunciation after announcing last year it had made the dire wolf, a species lost from the world for more than 10,000 years, “de-extinct” via the birth of three new pups.

Decoded genome of meat in pup’s stomach helps scientists build picture of what caused extinction of species

Researchers have shed light on the final centuries of the woolly rhinoceros after studying a hairy lump of meat from the stomach of an ancient wolf cub that became mummified in the Siberian permafrost.

The beautifully preserved remains of a two-month-old female wolf cub were discovered in 2011 near the village of Tumat in northeastern Siberia. The animal is thought to have died 14,400 years ago when a landslide collapsed its den, trapping the cub and others inside.

The bioscience startup has attracted billions in investment – and a flurry of criticism, but founder tells the Guardian plans to bring back the woolly mammoth will not be derailed

Death and taxes are supposed to be the things we can depend on in this life. But in 2025, the American entrepreneur Ben Lamm sold much of the world on the idea that death did not, after all, need to be for ever.

This was the year the billionaire’s genetics startup, Colossal Biosciences, claimed it had resurrected the dire wolf, an animal that disappeared at the end of the last ice age, by tweaking the DNA of grey wolves. According to the company, it had also edged closer to bringing the woolly mammoth back from the dead, with the creation of genetically engineered “woolly mice”.