LifeExquisite spider fossils from Australia offer clues to their evolution A large brush-footed trapdoor spider and a small jumping spider from the Miocene Epoch between 11 and 16 million years ago show how different arachnids responded to rapidly changing climate News
LifeBone disease in sabre-toothed tigers may be a sign of inbreeding An analysis of bones from the La Brea tar pits in California reveals that sabre-toothed tigers and dire wolves had very high rates of osteochondrosis, which may stem from a dwindling gene pool as they neared extinction News