Unlucky giant elephant shrew
“The giant elephant shrew, found by accident in the dense forests of central Tanzania’s Udzungwa Mountains, is the first such mammal to be discovered in more than 126 years.”
Talk about unlucky. You develop an ecological niche that successfully keeps you away from the most devastating predator on the planet, Homo sapiens, for thousands of years and then one of them goes and discovers you by accident. Enough to drive you to extinction.
Here’s the full report from New Scientist <link>.