I know at least one person has been wondering
about which end of the egg comes out first. Not exactly breaking
news, but the egg initially moves through the chicken's oviduct
small end first. When it reaches the uterus, the shell calcifies,
rotates 180 degrees, and moves on big end first. When the muscles of
the chicken's uterine and vaginal walls finally contract to squeeze
the small end, it helps to expel the egg forward.