An astonishing collection of fossil animals from southern Australia is reported by scientists. The creatures were found in limestone caves under Nullarbor Plain and date from about 400,000-800,000 years ago. The palaeontological "treasure trove" includes 23 kangaroo species, eight of which are entirely new to science. Researchers tell Nature magazine that the caves also yielded a complete specimen of Thylacoleo carnifex , an extinct marsupial lion. It appears the unsuspecting creatures fell to their deaths through pipes in the dusty plain surface that periodically opened and closed over millennia. Most of the animals were killed instantly but others initially...