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Javan green magpies are high on the list of endangered species. They were formally listed as critically endangered. Occasionally, they show up in the markets.

鈥淎 new, trapped bird turning up in the market is one of the few ways we have to confirm that there are still wild populations,鈥� says Owen. 鈥淭hey鈥檙e so difficult to find in the forests now.鈥�

The bird I watched in the conservation aviary was found for sale in a market in the West Javan city of Bandung.

At her new home at the Cikananga Conservation Breeding Centre, the bird has been named Jimat - the Indonesian word for mascot - by centre manager Anais Tritto.

鈥淲e received word that there was a Javan green magpie in the market there in December 2014,鈥� she says.

She and her team needed photographic evidence, so they sent someone to the market with a camera.

鈥淭he pictures showed a bright blue magpie - not the normal colour for this species.

鈥淏ut when they鈥檙e kept in cages, their colour changes from green to bright blue.鈥�

The birds literally fade as they survive in a cage on an inadequate diet.

In the wild, they naturally dye themselves bright green by eating lots of green insects that contain a yellow pigment called lutein.

鈥淚n the market, the bird only receives commercial pellets, brown crickets and mealworms, so they fade to blue,鈥� says Tritto.

Finally, a team from Cikananga was dispatched to Bandung, to confiscate the bird.

鈥淎fter the bird was moved to our aviaries, and received a diet supplemented with lutein, little by little after moulting, she came back to her original colour,鈥� says Tritto.

Even the high fences and locked aviaries of Cikananga have been targeted by bird trappers looking for the rarest birds to sell.

A few months before Jimat鈥檚 rescue and her arrival at Cikananga, the bird keepers walked through the gates in the morning to find the place strangely quiet.

鈥淵ou normally hear so much noise in the morning - it鈥檚 like a contained dawn chorus,鈥� Jonathan Beilby from Cikananga explains.

鈥淭hey realised that all the aviaries on one side had been ripped open and dozens of birds had been stolen.

鈥淭he robbery focused on black-winged mynas - they took 140 birds.

鈥淥ne of those might fetch 1.5m rupiah - over $100 - which is more than a month鈥檚 wages for some people.鈥�

The team was devastated.

Cikananga is home to the rarest of the rare, such as the critically endangered magpies and mynas - as well as rufous-fronted and Sumatran laughingthrushes.

Every pair of these birds provides the prospect of a stronger future for each species.

Before they鈥檙e introduced to a potential mate, every bird is genetically screened to work out which males and females are most biologically compatible. They are then carefully monitored.

Years of this painstaking conservation work was wrecked in one night by that break-in.

It meant, though, that by the time Jimat arrived to join the other 60 Javan green magpies that the thieves had left behind, the aviaries had received a security overhaul.

CCBC is now surrounded by a high, metal fence. Guard dogs patrol the outer yard and a CCTV network covers every enclosure, providing 24-hour coverage.

That also allows the team here to monitor the nests - keeping a close watch over eggs and precious chicks.

The team thinks the robbers might not have known that the magpies were in the block of aviaries just next door to the ones they raided. If they had, they would almost certainly have taken those birds, too.

鈥淓veryone who keeps songbirds wants a magpie,鈥� says Chester Zoo鈥檚 Andrew Owen.

鈥淭hey鈥檙e used as teacher birds, because they have such a complex repertoire of songs.鈥�

As the birds instinctively try to out-sing one another, they pick up new sounds and put together repertoires that will earn them a higher score from an expert judge.

Today, Pranoto is helping to manage a competition run by the PBI - a bird breeding association of which he is a member.

PBI represents some of the upper echelons of the bird-singing world and runs its own competitions.

It has set up a small competition with white-rumped shamas and lovebirds - another of Java鈥檚 favourite avian singers.

It is a relatively small event - the prize money is only a few hundred US dollars.

Entrants arrive at the arena with their birds鈥� pristine cages covered up - many carrying special bird-cage backpacks, or with more than one birdcage strapped to a moped.

Six judges stand around the cages listening to the birds - which instinctively sing when they see one another. The birds are scored in three categories - tone, volume and performance.

The atmosphere is jovial - but be in no doubt, people are here to win.

Men - and almost everyone here is male - puff on cigarettes as they survey the competition. Owners signal, click and whistle to their birds to encourage them.

Tony Sumampau has arranged our invitation to the event. He is a wealthy and influential friend of the bird breeders association.

He owns and manages a successful safari park called Taman Safari, and says he now wants to invest profit from that business into helping save Java鈥檚 wild birds.

鈥淚n Java, to truly be a man,鈥� he says, 鈥渋t is said that you should have a house, a wife, horses - or transport - a weapon and a bird.

鈥淭hen you are real Javanese.鈥�

Sumampau, and the people at the head of the bird-breeding association, understand that owning birds is so deeply-rooted in local culture that it is pointless to fight the trade in the name of conservation.

Instead, they aim to encourage sellers to learn how to breed the birds that people want in captivity - to supply the trade sustainably and preserve the wild.

鈥淭his association has already banned wild-caught birds from its events,鈥� says Sumampau. 鈥淲e now want to encourage other associations to do the same.鈥�

For now, though, the dwindling pockets of forest habitat in Java are unsafe for wild birds.

Habitat is being destroyed by encroaching civilisation. More remote areas, once safe for wildlife because they were difficult to reach, are becoming more accessible.

To understand what drives poaching and trapping here, I went to visit Mount Malabar, a protected forest and the focal point of a mission by the organisation Conservation International (CI) to bring another victim of the pet trade back to the wild.

Here, CI is running a project to release endangered Javan gibbons which have been rescued from the pet trade.

The trade in primates is still a threat to endangered ape species in Indonesia, but this site and the work here provide a glimmer of hope for the gibbons.

A released male and female - both of which were rescued and rehabilitated - have just had a baby. It is the first born in the wild here.

Part of Conservation International鈥檚 success is its work with former hunters and trappers, like Uwas, my guide on a trek to spot the newly wild gibbon family.

鈥淚 used to hunt here, so I know this forest,鈥� says Uwas.

鈥淚 would catch any birds - from big to small birds. Anything that lives in this forest.鈥�

Uwas shows me how to build a small bird trap from just a few twigs and some string.

It is a spring-loaded device that snatches up a bird鈥檚 legs in a loop.

Trappers鈥� methods are adapting quickly, though. Surveys carried out here and in other areas of forest habitat, show that larger numbers of birds are being targeted by increasingly high-tech methods.

Chester Zoo鈥檚 Andrew Owen has seen evidence of bird-trappers using large mist nets - where metres of netting are strung up to capture anything that flies.

Uwas no longer hunts, because he is now able to channel his knowledge of the forest into his new role monitoring and protecting the gibbons - including patrolling for any sign of illegal hunting in the protected parkland of Mount Malabar.

鈥淚t was not my main job to hunt,鈥� says Uwas.

鈥淚 would just do it when I had no work and needed money.

鈥淲hen I started to work here, I realised how important these animals and the forest are - for all of us.鈥�

But many do not have the opportunity of a new job in conservation.

Thirty million Indonesians still live in poverty - and trapping is a guaranteed income, because demand is still so high.

Many in Indonesia are feeling the positive effects of their growing economy, and there is more disposable income - income that is used to buy birds.

The aim for the future of the birds at Cikananga is to move beyond life in a cage. The team hopes ultimately to release the birds bred here into the wild.

But their attempts to find somewhere safe to do this have so far been unsuccessful.

Even with the ranger patrols, trapping still happens in Mount Malabar鈥檚 forests.

And the green hills and agricultural land close to Cikananga itself - still peppered with trees - looks like good habitat upon first viewing. But surveys have found trappers to be active in the area.

This is where Tony Sumampau comes in.

Taman Safari, his park in the hills between the towns of Bogor and Sukubumi, is 260 hectares of highly forested land.

While the jungle fairground that is the safari park is in the centre, there is still a large area of undeveloped forest.

So he is using his own land to provide a safe home for the critically endangered black-winged myna.

So far, 15 birds born and bred in the aviary at Taman - tucked away from the animal shows and selfie-snapping tourists - have been released into the forest.

At Cikananga, the team hopes that Java鈥檚 children can become the future custodians of their environment.

Ade Imansyah, an education officer at the centre, visits local schools regularly to talk to the children about the wildlife that is - or should be - on their doorstep.

Here, in these upland villages, a few hours from the chaos of the city, most of the children have parents who farm.

Birds, he explains to the attentive children, are not just pretty, feathered singers. They鈥檙e also natural pest-controllers - feeding on insects that eat the crops.

鈥淚 hope they will understand the benefit of wild animals and birds for them, for their parents, for their agriculture,鈥� says Imansyah.

Birds like Jimat - one of the few remaining members of her species - face a future under lock and key in the secure Cikananga aviaries.

The determined team there have years of work ahead to keep these birds safe and to breed them in captivity.

Jimat herself has just been introduced to a new mate in the hope that she will raise some precious Javan green magpie chicks.

If any patch of forest can be made safe, they might once again fill the mountains with the alluring, complex song that made them such a target.