But, as is often the case in the animal kingdom ... Depending on the species, the egg-holder might be mother or father, who will keep fertilized eggs tucked safely behind their jaws.

A few might be livebearers instead of egg layers, but without question more than 99% of the world’s animals described to date lay eggs. One nonmammalian that births live young is the mosquitofish.

Some animal ... eggs are laid. The dads in barn owls and burrowing owls, especially, scout out prey, store extra food for later, and fiercely stand guard against potential intruders or threats ...

Since there are way more eggs than there are mature animals, and a lot of them die, natural selection for survival through the egg stage is likely extremely powerful, says Warkentin. And now, ...

Most animals develop from a fertilized egg ? the zygote. The question of why eggs require fertilization to begin development is an old one: how are they prevented from spontaneous development ...

Canadian egg farmers are future-focused and are continuously looking for ways to improve their practice so consumers can continue to have access to the best eggs possible and our animals are well ...

Montgomery is the author of “What the Chicken Knows” and other books on animals ... eggs, I was elated. I had gotten the hens to keep me company, but nothing tastes better than an egg from ...