Speaking of doo doo...

That excerpt that I linked to earlier which mentioned the egg being a symbol of life reminded me of the Egyptian symbol of the scarab beetle. Here's some information about that symbol:

"Containing the very power of eternal life, the Beetle's regenerative energies are closely associated with life renewal. The habit the Beetle has of rolling a ball of dung as a future source of nourishment for its babies, is an ancient symbol of the World Egg, from which all life and manifestation arose.

It is thus regarded as being self-generated. Perfection out of what seems imperfect. A symbol of resurrection, the Beetle is the most varied of all insects, as many as 280,000 different variations. To put this in perspective, the number of vertebrate animals - including fish, reptiles, amphibians, birds and mammals, is around 44,000.

In Egypt, the Scarab Beetle has great significance. Taking a piece of ox dung, it would roll it along a horizontal path from east to west and gradually shape the dung into a ball. Eggs are laid within and then buried in the ground for about a month. After this time, the Beetle would dig up the ball and push it into the water and its young would emerge. Because of its east to west rolling, it became associated with the Sun and its movement across the sky.

The Scarab thus came to be a symbol for solar deities and for new life. As with many insects, the Beetle goes through a tremendous metamorphosis from the grub stage to the winged. Because of this, it is associated with resurrection and change, much as the butterfly is as well. In its winged stage, the front set of wings are thickened into hard covers which fold and protect the soft underside; the back, larger wings spread out as that of a Hawk".

Source: http://www.katiestanley.com/resources/dd/b.htm