The avian egg shell serves as much more than just mechanical protection for the developing embryo. It is also an antimicrobial defence; a reservoir of calcium for the embryo; acts in exchange of ...

Herpetologica, Vol. 38, No. 1, Reproductive Biology of Reptiles (Mar., 1982), pp. 136-155 (20 pages) Eggs of oviparous reptiles can be assigned to one of three broad categories on the basis of ...

Here’s a question about chickens and eggs you may not have heard before: How is it that an egg can be so hard to break from the outside, yet so easy for a weak little chick to peck through from the ...

A perfectly preserved dinosaur embryo has been found in China: little Yingliang reveals the posture of birds before birth.

Sometimes, you open up your carton of eggs and you may notice one egg in particular has a few wrinkles or folds in the shell.