The word oviparous refers to animals that lay eggs which hatch externally.In other words the female retains the fertilized eggs in her body until they hatch, so that "live" young are born. Depending on the species, the eggs of oviparous animals may be...

In most birds and reptiles, an egg (Latin ovum) is the zygote, resulting from fertilization of the ovum. To enable incubation the egg is usually kept within a favourable temperature range as it nourishes and protects the growing embryo. When the embryo...

Getting from the egg to the chicken Every chicken, toad or person starts as a single cell that multiplies and differentiates into spatially organized structures such as digits on a limb. This developmental process remains one of the great unsolved mysteries of...

In a series of recent experiments, scientists have transformed cells from mouse embryos into skin, heart muscle, and even eggs. In addition to providing insight into how such tissues develop, these feats have renewed the political and ethical debate over whether similar experiments...

Karen Courtemanche might be getting new neighbors, and she hears their stench is unbearable.Courtemanche lives a mile and a half from the site of a proposed 900,000-chicken farm, but she and other residents aren't putting out any welcome mats."I'm sorry, we just don't want them...

The first pregnancy achieved with egg donation was reported in 1984. Since then, demand for donor eggs has quickly increased.If you are considering donating eggs, fertility doctors say there are a number of things to remember, including the fact that it can be a time-consuming...