A team of researchers is in Costa Rica attempting to track down some of the world's rarest frogs to aid their conservation.
The country used to be teeming with amphibians, but numbers have plummeted in recent years - largely because of a deadly fungus.
Science reporter Rebecca Morelle joins the University of Manchester and Chester Zoo team as Experts poised for rare frog hunt ...
Live text - England v South Africa ...
Guantanamo war crimes trial begins ... they head into the rainforest.
3 SEPTEMBER: HIDDEN HORRORS
A howl of pain cut through the rainforest.
We had just passed an ants' nest - but these weren't just any old ants - they were bullet ants, and herpetologist Andrew Gray had just been bitten by one of them.
These huge insects earned their name because their formic-acid-loaded sting is supposed to be as painful as being shot by a bullet.
Andrew said it felt excruciating.
Bullet ants, I soon found out, were just one of the many dangers lurking in the rainforest.
A host of venomous snakes - including the fer-de-lance, responsible for the most number of snake-bite deaths in Central America - deadly spiders and jaguars can be found in the swathe of Talamancan mountain range where the Costa Rican Amphibian Center rainforest is based.
To say that I felt a little afraid as we trekked through the dense forestation was an understatement.
My fear-filled yelps soon joined the rainforest's chorus.
Every vine, fallen branch and root seemed to look like a snake - and in fact, some turned out to be snakes, along the trail we passed three deadly fer-de-lances. Each step seemed to entangle me in another spider's web and bullet ants swarmed as we passed their nests.
I didn't see any jaguars, though.
A rare sight
Deadly creatures aside; back at the pond, we managed to catch a glimpse of some frogs' breeding.
A female red-eyed tree frog was sitting on a leaf, her belly swollen almost to the point of bursting with eggs.
On her back, a smaller male was clinging on, waiting for her to spawn so he could immediately fertilize the eggs.
Sure enough, a little later, she started to spawn - the male helping her along by giving her a squeeze, then fertilising the eggs as they popped out on to a leaf hanging just above the pond.
In about five days' time, the tadpoles will drop down from the leaf into the water where they can begin their transformation into frogs.
2 SEPTEMBER: AMPHIBIAN HAVEN
As dusk fell and we began our descent into the rainforest, I remembered somebody telling me that rainforests only come to life at night.
And as soon as I turned on my headtorch, I could see that this was indeed the case when swarms of moths, mosquitoes and who knows what else began to gravitate straight towards my face.
I have joined Andrew Gray, Mark Dickinson and Steph Dawson from the University of Manchester and Douglas Sherriff from Chester Zoo as they head into the rainforest to work on conservation projects for some of the world's rarest frogs.
On the way to the Monteverde highlands, where the species we are looking for are thought to live, we visited Brian Kubicki's Costa Rican Amphibian Research Center - 112 acres (45 hectares) of rainforest that has the highest concentrations of amphibians anywhere in Costa Rica.
It has been a labour of love for Brian.
He set up the centre in 2002, and has spent the last few years conserving and modifying the land to transform it into an amphibian haven.
Brian said that it stands in stark contrast to Monteverde and other highland areas.
There, frogs and toads are now seldom seen. One reason is the chytrid fungus that has swept through the area, a disease to which many species fall prey.
Frog chorus
We headed to a pond that sits just at the start of the centre's rainforest trail.
As darkness fell, a symphony of croaks, blips, chirrups, redipps and whoops began to fill the air as the male frogs and toads sounded their calls to lure passing females.
A scan with a torch - a handy tool for the rainforest, which is blacker than black come nightfall - brought the frogs into view.
Red-eyed leaf frogs sat perched on leaves, displaying their vivid colours.
Dozens of minuscule hourglass tree frogs inflated their throats to sound their high-pitched blips, and even smaller tink frogs hopped around.
And lurking, hidden in the vegetation at the pond's edge, sat enormous smoky jungle frogs waiting for a passing snack - be it a small mammal or even frog - to come scuttling past.
These frogs have a clever defence against predators.
Andrew Gray, who is leading the conservation expedition, showed me how this works - as soon as the animals are picked up, they begin to emit a high-pitched scream.
They also have two sharp spikes on their bellies, and are covered with a sticky slime that is packed full of poisonous peptides.
As he released the frog back into the pond, he told me that in some areas, the frogs - sometimes also called mountain chickens - are a delicacy.
After my first encounter last night, I'm not so sure I would want to eat one…
(BBC)
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