A parasitic fly that eats human tissues and lays eggs in open wounds has been detected just 90 miles from the U.S. border. New World screwworms also deposit their eggs, which hatch into maggots and ...

European cuckoos lay very different eggs depending on the host species. Genetic analyses have revealed how this adaptation is inherited without leading to speciation. Bright blue, white, greenish, ...

Eggs helped animals conquer land—but most mammals stopped laying them. Why is that? Why do most animals lay eggs, while humans and most mammals give birth to live young? In this episode of Big Ideas ...