Stavros is a product of thousand millennia of evolving life-forms on Earth.
His ancestry can be traced to protozoa in the end of the Hadean.
His family line can be followed through cyanobacteria and multicellular organisms around 1,400,000,000 BCE.
In 350,000,000 BCE the first tetrapod Stavroses emerged, allowing for rapid movement on land. This was handy, given his reticence to spend a life submerged in the ocean.
Finally, the evolution to bipedalism in 260,000,000 BCE has freed up Stavros's upper limbs to allow for jotting down math abstractions and abide with his attempted avocational mastery of Conservation Laws within the realm of Symmetry in the context of QFT.