known as calcium oscillations—a process crucial for proper egg activation during fertilization, and the ... Sperm size varies dramatically among different animal species. But why is sperm size ...

Birds are a ... the typical songbird egg, an embryo spends two weeks being constantly incubated at high temperature and humidity. It grows rapidly from a single fertilized cell into a featherless ...

We know that female wasps, fish, birds, and lizards can produce ... In the lab, scientists can coax unfertilized eggs into beginning the post-fertilization process by simply injecting them with ...