Proof that God has a sense of humor.
Or more honestly the ultimate transition example!
Not really. I assume you look at it's bill and assume it has a duck as an ancestor. I could be mistaken, but I don't believe that a platypus shares any significant DNA with duck. Try again.
No, you assume wrong, of course, it is a lot more than that!
A team of scientists has determined the platypus’ entire genetic code. Down to its DNA, it turns out, the platypus continues to strain credulity, bearing genetic modules that are in turn mammalian, reptilian and avian.
There are genes for egg laying, evidence of the animal’s reptilian roots. Genes for making milk, which the platypus does in mammalian style despite not having nipples. Genes for making snake venom, which the animal stores in its legs. And there are five times more sex-determining chromosomes than scientists know what to do with.