Cybertronian

"We were once a peaceful race, of intelligent mechanical beings." - Optimus Cybertronian's are mechanical being's who originate from their home planet of Cybertron, once a peaceful rage of indigenous.

Biology
Cybertronians have a

Spark
"We call it a spark, it contains our life force and our memories." - Optimus explaining a spark to Cade; All Cybertronians contain a spark stored inside their body similar to that of a human heart

Scanning
After arriving on Earth a Cybertronians will need to take on the form of a vehicle, whatever vehicle that they scan their appearance changes to form the boddy simlar to human clothes

Energon
The life blood and fuel of all Cybertronians is Energon,

Voice
"''We've learned Earth's languages through the World Wide Web." - ''Optimus explaining how Cybertronians can speak

Originally Cybertronians have their own unique language while a majority of the decepticons retain their home language when speaking, the Autobots however after becoming integrated with Earth have learned how to speak human.

LIst of Cybertronians whom can speak in human language.

Megatron

Starscream

Soundwave

Shockwave