By Rebecca MorelleScience reporter, BBC News, Guam
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.
Lär mer här: http://www.bbc.co.uk/news/science-environment-17992053
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