The genome of the platypus,
We read today in Nature,
Befits a beast so odd it once
Defied our nomenclature;
A mammal, but it still lays eggs,
And you know what that means:
The platypus and lizards share
Some families of genes!
Although the tale is quite complex–
A long way off from solved–
The genome of the platypus
Shows how we all evolved!