In the dense tropical forest, a slither of movement can just be made out in the glow of our head torches.
A snake is entwined in the undergrowth. It is about 1m long, mostly dull brown but with a vivid yellow underbelly.
We are face to face with Guam's "nemesis": the brown tree snake. And the forests here are dripping with them.
The US territory, in the western Pacific, is only 50km (30 miles) long and 10km wide, but it is packed with two million snakes.
This reptile arrived here only 60 years ago but has rapidly become one of the most successful invasive species ever.
Wildlife biologist James Stanford, from the US Geological Survey, says: "Our belief is that they came at the end of World War II.
"We've looked at their genetics and they are all extremely closely related, and it appears they came from the Island of Manus in Papua New Guinea."
In: WTF, Other Entertainment, Science and Technology, Other
Tags: Brown, snake, invasive, species, taking, guam, over
Location: Guam (load item map)
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