Mysteries lie in wait in Kenya's museum

NAIROBI, Kenya - The only hint that something extraordinary lay inside the plain wooden drawer in an unassuming office behind Nairobi National Museum was a handwritten note stuck to the front: "Pull Carefully".

Inside, a monstrous jawbone with colossal fangs grinned from a bed of tattered foam: the only known remains of a prehistoric mega-carnivore, larger than a polar bear, that researchers only this year declared a new species.

"This is one-of-a-kind," said Kenyan paleontologist Job Kibii, holding up the 23-million-year-old bones of the newly-discovered giant, Simbakubwa kutokaafrika, whose unveiling made headlines around the world.