Who's Kidneying?

I recently found out something really neat about the Evolution of Development (Evo-Devo):

Mammal Embryos develop 3 sets of kidneys.

The first (pronephros) is the same set found in primitive fish like Lampreys.

After 3.5 weeks, the mammal embryo replaces it.

The second set (The Mesonephros) is the same set found in higher fish and amphibians.

In human males it gives rise to urogenital structures, while in females the remnants are vestigial.

The third set (Metanephros) is the set which develops and becomes the adults set of kidneys, and it is the same set found in mammals and birds.

Neat, huh?

I also made this into a video here.
Links:
http://www.embryology.ch/anglais/bvueOrgan/vueorgan.html#anc20
http://www.uoguelph.ca/zoology/devobio/210labs/kidney2.html
http://www.britannica.com/search?query=Mesonephros&ct=&searchSubmit.x=0&searchSubmit.y=0

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