Lystrosaurus seems to have followed a different path, one based on large, yolk-rich eggs and young that were likely precocial. Large soft-shelled eggs may also have helped in another way. Bigger eggs ...

(CNN) — Researchers studying a 250-million-year-old fossil have found the first ever proof that mammal ancestors laid eggs, with the discovery also shedding light on a remarkable survival story. The ...

The little skeleton was curled so tightly it looked as if it had never really entered the world. For years, that mattered because paleontologists suspected they were looking at something unusual, a ...