For most animals, reproduction is straightforward: Some species lay eggs, while others give birth to live babies. But our recent research uncovered a fascinating mix between the two modes of ...

Study identifies new gene that may increase risk for preterm birth Evolutionary changes that make us uniquely human - such as our large heads and narrow pelvises - may have "pushed" human birth timing ...

The old riddle, “Which came first, the chicken or the egg?” is relatively easy to answer as a question about the evolution of birth in animals. Egg laying almost certainly came before live birth; the ...