Our Planet
The silvery wash of the moon illuminates the invaders in our garden
Marine conservation is about proper management not numbers
Lion killed California intern with one swipe of its paw, coroner reveals
Deer cull would threaten thousands of jobs, say furious gamekeepers
We must kill Bambi: why culling deer is a no-brainer
Five shark species win protection against finning trade
Pangolins under threat as black market trade grows
Should we learn to love eating insects?
Rare Sumatran tiger kills farmer in Indonesia
Where screeching, scarlet macaws enjoy raucous celebrity status
Summer's early birds risk their return from wintering grounds
Mexican monarch butterfly numbers at record low, scientists say
Military three-step as birds drill for food through the late winter snow
Beachcombers to hunt out 'mermaid's purses' to help protect sharks
French troops return to the heart of D-day operations
A landscape bathed in cold brilliance
Birdwatch: Pied-billed grebe
National Wildlife Crime Unit left in funding doubt
86 elephants killed in Chad poaching massacre
Polar bear hunting and migration 'hit by warming climate'
Cloning extinct animals: to hell with frogs!
Spring is in the air and Zoroastrians and hares and pagans. And me
When the icy wind drops, the first hint of warmth can be felt in the sun
Don't let good zoos go extinct
  Don't let good zoos go extinct
You must see Jae Jae, Sumatran star of London Zoo's Tiger Territory," I said. "Charging past you three feet away, in a huge enclosure full of trees breathtaking!" (The Tiger Territories has just opened.) "I don't agree," my friend said, "with keeping wild animals in a capital city for entertainment."

But their wild homes are vanishing, they're not there for entertainment and the aim of good zoos today is conservation.

Most zoo animals are born in zoos. The days of whisking them from the wild are long gone. Zoos breed wild animals co-operatively, internationally. Genetic software ensuring diversity, building a hedge against extinction in the wild decides which tigers meet up. Jae Jae comes from Ohio; his mate from Australia. Jae Jae wouldn't last a week in a Sumatran jungle. He doesn't know about kraits, cobras and poisonous lianas or how to catch live food. He'd be done in by another male if he didn't starve first. What he's doing in London is supporting the world's 3,000-odd wild tigers.

Since the 1970s wild animals' habitats have disappeared. Responsible zoos have become places of education and science whose prime concern is conserving the wild. They house animals in the social groups and habitats they like. London's famous modernist Penguin Pool is an example of how not to house wild animals as art. The design was egg-inspired, but no penguin eggs appeared. Today, London's penguins breed in a pool that reproduces their natural habitat. Tiger Territory does the same, minus kraits and cobras.

"Nature" is an emotive word: many people who only associate it with the word "free" don't see the whole picture. Today, everywhere, nature is enclosed. "Natural" is not "unboundaried". From the Amazon to Camley Street Natural Park in King's Cross, London, nature survives in islands squeezed by the default environment human habitation. Zoos are a concentrated image of the way nature has to survive in our world now, because of us. Tigers have lost their forest homes to coffee plantations in Sumatra; bauxite mines in Orissa in central India where the aluminium in your mobile phone comes from; and to paddy-fields for basmati rice.

"In wildness," said Thoreau, "is the preservation of the world." But with 7 billion of us here too, wildness has to be legislated for, managed and protected by field projects that implement environmental legislation, work with governments, local communities or industry, and tackle illegal logging, mining and poaching. Jae Jae's wild cousins are the frontline of today's terrifying hike in wildlife crime. Last year, just in Sumatra, poachers killed at least 32 tigers.

Between 1998 and 2005, 12% of dedicated tiger conservation funds came through zoos. London Zoo is run by the Zoological Society of London (ZSL), a charity dedicated to conserving wild animals and where they live. Ten per cent of what ZSL invests in displaying gorillas and tigers goes to protect the same animals in the wild.

Zoo breeding means that some species, such as Prezwalski's horse, can be successfully reintroduced to the wild. But you need the right habitat with enough food, and reintroducing large animals that endanger people is politically delicate, so conservation breeding programmes not only act as a backup (if wild tigers go extinct they can be replaced by zoo-bred tigers) but also generate support, directly and indirectly, for wild programmes.

ZSL spearheads this interplay of breeding, advocacy and conservation. Zoo entry fees underpin its conservation projects in 50 countries. Its Institute of Zoology, a world-renowned centre for conservation biology, makes sure that these are based on sound science. Scientists in its Wild Animal Health programme, for example, research and monitor infectious diseases in wild animals and assess risks of infection in moving or reintroducing them to the wild.

Scientists learn from zoo animals how to protect their wild cousins better. Some wild tigers, for instance, need to be anaesthetised, to be radio-collared, healed or (if endangering human lives) relocated. But anaesthetics can be dangerous and tigers used to humans help vets decide the correct dose. But, above all, zoo animals support their wild relations indirectly as ambassadors: through education and the inspiration that comes from direct contact. TV is not enough. In 1838, Charles Darwin spent days in London Zoo with an orangutan: their interaction was fundamental to his insight into evolution and animal expressions.

A recent National Trust report said that children suffer more in Britain than other developed countries from "nature-deficit disorder". As I've written elsewhere, a friend of mine once took a class of inner-city seven-year-olds to London Zoo. They exhausted the school's supply of black and yellow crayons beforehand; they studied The Tiger Who Came to Tea. After gazing into a live tiger's eyes and seeing it gaze back, Roxanna turned to her teacher: "You didn't tell us they were real," she said.

Wild animals need Roxanna. To survive, wild nature needs future generations to care about conservation. Jae Jae was born in a zoo. While enjoying his London life, he will make millions aware that wild tigers are real and need help. Entry fees to see him, to be close to nature in one of its most extraordinary and glamorous forms, help to protect his endangered cousins whose pugmarks I saw in Sumatra and Russia, Nepal, Laos, Bhutan and India, but perhaps not much longer, anywhere among those kraits and cobras, in the wild.
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