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|source = - [[Commissar]] [[Holt]]{{Fn|52c}}

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[[Image:SManatomy.jpg|thumb|right|250px|The many implants and abilities of a [[Firstborn]] Space Marine{{Fn|3a}}]]

Space Marines represent the pinnacle of Imperial bio-engineering. They are larger, stronger, faster,{{Fn|51b}} and more durable than average humans. Most also display higher cognitive abilities, such as very accurate powers of recollection and a capacity to process information within mere nanoseconds.{{Fn|53}}{{Fn|62b}} Space Marines have frightening strength, which when augmented by power armour allows them to act as living battering rams capable of smashing through fast-moving light vehicles or crush human heads into pulp.{{Fn|55}} Space Marines also display superior vision, hearing, smell, sun/radiation resistance, and taste than standard humans. They have far greater resistances to heat and cold and can even survive for a time in the vacuum of space.{{Fn|2}}