Dear Vector Prime, why are the Children of Earth and Cybertron so often intertwined to the point where in many realities their fauna, including sapient Cybertronians, resemble Earth life to the point of simply being mechanical and organic versions of the other?
Dear Convergence Cogitator,
One of the fascinating parts of life is how such coincidences emerge. It seems many times that particular niches produce similar beings, despite such different origins. Let us take the humble porcineacon for example, analogues have been found on Quartex and Hydrus IV and even organic equivalents exist on worlds such as Kronos, Elonia, and Earth.
At first this may seem ridiculous. If the universe is infinite, why are similar creatures emerging time after time? But of course, morphology is correlated to suitability. A porcineacon's drills allow it to search for subsurface energon conduits and insecatrons on which to feed. Its olfactory sensor is enlarged to allow for maximum input, while its chassis is covered with a series of sensor spines that stand erect when the beast detects a threat. Likewise the bodies of narlihogs and targs are suited for their lifestyles, and although each has their own variations due to their native biology and ancestors, their ecological niches have ensured convergent evolution has taken place.
Of course, evolution being what it is, many of these creatures have changed niches and changed further. Some have even become civilization-building humanoid species, such as the Urtuskians and Skuxxoids.