Monday, March 8, 2010

Platypus - the evidence for macro-evolution

The platypus is an Australian semi-aquatic duck-billed, furry mammal that lay eggs. Interesting? Wait and I thought mammals don't lay eggs??

Answer - Evolution.

The platypus IS A MAMMAL because it produces milk, feeds the young with milk, has hair, is warm-blooded.

But the interesting thing is the platypus lays eggs!


Because evidence show that mammals descended from reptiles (which lay eggs), and the platypus has retained this reptilian egg-laying characteristic from our reptilian ancestors. Egg laying is a primitive reproduction method passed down from mammal-like reptiles 300 million years ago.

The platypus split from other mammals at least 166 million years ago.

This early split means the platypus genes carry important information from a transitional point on the evolutionary line leading from reptiles to mammals and it retains some characteristics from its reptilian ancestors.

Platypus. The real life evidence for macro-evolution. Reptiles to mammals.

"The platypus genome, like the animal itself, is an amazing amalgam of reptile-like and mammal-like features," said project co-leader Jennifer Graves, of the Australian National University in Canberra.


  1. Another thing that makes a platypus a mammal is that it has three middle ear bones.

  2. Amy is right!

  3. Platypus also have sexual chromossomes more similar to birds than reptiles or mammals: